It may look to you like it’s front of the line or directed around the line, but most of the places you mention have something about the line or boarding that makes part of it not accessible and most guests with wheelchairs wait in the regular line for a portion of time until they get to the inaccessible area.
The newer parks (AK and the Studio) were built with guests using wheelchairs and
ECVs in mind. The older attractions at MK and Epcot were designed to ‘deliver’ a steady, single file line of guests to the boarding area and make sure that the guests at the unload area don’t interfere with loading.
This means that the boarding area and the unload area at older attractions are often at totally different places or are on opposite sides of a track.
And, to keep people in line, there are often narrow gates or bars at the boarding area.
These things make it difficult to get a wheelchair from the usual boarding area to the exit unless guests using them board at the exit.
Small World - ‘regular’ boarding is on one side of the water with gates to separate rows. Unloading is on the other side of the water. There is not a way to have guests with wheelchairs load in the ‘regular’ loading area. My DD has a wheelchair and we are always directed to get into the line until it comes to the point where it would not be possible to get out of the line with the wheelchair. We have also ridden at times when the ‘regular’ line was posted as 5 minutes, but we waited in the accessible line for 25 minutes because there were many people ahead of us.
Peter Pan - the ‘regular’ boarding area is not accessible. A wheelchair won’t fit through the line and if it would there would be no way to get the wheelchair from the boarding area to the unload area because it is small and narrow.
This attraction can also only be slowed or stopped in an emergency, so can’t be ridden by anyone who is not able to move quickly enough from the wheelchair to the ride car.
Pooh - the regular and Fastpass Lines are both wheelchair accessible. The last few times we rode, we had Fastpasses and still had CMs telling us we needed to get into the regular line because it was accessible!
Facing the ride, guests board at the left side of the ride track and get off on the right. CMs have to board guests with wheelchairs toward the left side of the ride track where there will be room to keep the wheelchair while the guest rides.
Haunted Mansion - the regular entrance goes into the stretching room and boarding is in one area with unload at a totally different location. It would not be possible to move a wheelchair from that boarding area to the unload area.
We have almost always been directed into the regular line until it gets to the point where the hearse is on the right side of the path (the wheelchair pull off point). That is the last point where guest with wheelchairs can get out of line because if they continue any farther, they will reach the turnstiles and entrance into the building.
If they can walk 200 feet and stand for the preshow, they can park the wheelchair in the exit courtyard and walk into the stretching room. The CM will take them into the next stretching room show, but because of where the pull off is, the group of guests who were right ahead of them in line will most likely be in the same show.
If the guest with the wheelchair can’t stand and walk, they have to skip the stretching room. That is our DD’s situation. If we arrive when there are not many people waiting, we may get on almost right away, but there are fire evacuation rules about how many guests who would need evacuation in an emergency can be on at one time. This includes guests with mobility disabilities, but might also include things like guests who are blind and would have a hard time getting out in narrow areas.
Sometimes, we have had to wait for other guests to board ahead of us and sometimes we have had to wait for enough to get off for the fire safety rules.
We have also gone when part of our party came with DD in her wheelchair and part went through the whole regular line - guess what - we all ended up done within a few minutes of each other (and more than once, the group with the wheelchair was done last).
Splash - there are 2 problems here, stairs in the line and the fact the boarding occurs on one side of the track and unloading at the other side. Both the regular and Fastpass Lines are wheelchair accessible until reaching the point of the stairs. At that point, the line and boarding area are not accessible and there is a wheelchair pull off which leads to a waiting area. Guests with wheelchairs/ECVs wait there until called by a CM. This could be a short wait or a long one; it depends on how many other guests with wheelchairs are waiting and how many guests who would need evacuation are on the ride.
Someone posted recently that he always just goes there without waiting in line, but we have run into CMs who do not even want to let us get out of the line at the stairs and were watching and sending people back into line if they had not waited.
Space - DD can’t ride Space Mountain because it would not be safe for her, but one line is accessible and I know people with wheelchairs who have used that line and waited with everyone else. This is another one where the guest with a wheelchair would need to be evacuated in an emergency. It is also an attraction with a very limited time to get into and out of the ride car.
BT Mountains - DD can’t ride this, but I do ride it and I know of 3 problems for guests with wheelchairs. One is the steep ramp that is part of the queue; it is very difficult to hold a wheelchair on a ramp like that for any period of time. The other is that guests board on one side and exit on the other, so a wheelchair would need to be brought over the line. Not all ride cars end up in the same place, so guests with wheelchairs need to board at the correct place to be able to end up where their wheelchair is.
Also an evacuation concern.
Spaceship Earth - the regular boarding area gets gradually narrower and narrower and has a moving walkway. One side of the circular moving walkway is the boarding area and the opposite side is the exit. There is no way to get a wheelchair into the normal boarding area. The wheelchair boarding area is at the exit because that is the only place guests can board and have their wheelchair waiting for them when they get off. A CM takes names as people enter the waiting area and has the guests with wheelchairs wait until called. We have waited over 1/2 hour here when the wait in the regular line was 5 minutes. This is an attraction where guests coming into the parks go right into the line because it is the first attraction they see. Early in the morning, the regular line will be over an hour. Walking into line in the afternoon, there is seldom more than a few minutes wait for people who can use the regular line (and this is even during busy times like Spring break). At those times, guests with disabilities will wait many times longer than those who can walk in.
Soarin, - the regular and Fastpass lines are both accessible and I don’t know of any reason they would bring someone with a wheelchair into a different place to board unless it was a child on a MAW trip. We have always just entered the same way as everyone else and waited in the boarding area with everyone else. The wheelchair or
ECV is brought into the show room and parked near the ride vehicle during the ride. After the ride, someone else in the party can bring it to the guest. So, there is not any special boarding or unloading.
Maelstrom - the boarding area is not wheelchair accessible and there is not a way to get a wheelchair from the regular boarding area to the exit. The regular line is narrow and there are gates to separate guests while waiting for their boat. The wheelchair entrance is just a door farther down the boarding area so there is room to maneuver. CMs do need to move the wheelchair to the unload area after the guest gets into the boat.
Tower of Terror - We waited in the regular line. A CM does need to move the wheelchair from the load to the unload area. If there is not enough staff to do that, they may board guests with wheelchairs in another place.
Rock N Roller Coaster - I don’t ride this and it would not be safe for DD to ride. It is listed in the Guidebook for Guests with Disabilities as being a Mainstream line and that guests with wheelchairs should enter the regular line or get Fastpasses. I do know of people who have used the regular line with a wheelchair. Many people with mobility challenges can’t ride this because you need to be able to board and get off in 30 seconds and many can’t do it that fast.
Safari - both the regular and Fastpass lines are accessible until they reach a point just after the 2 lines merge (also just after the stroller drop off point). Guests who continue in the regular line at that point will board at one ‘station’ and when they are done with the ride, they will be getting off at a different ‘station’. If guests with wheelchairs did that, there would be no way to get the wheelchairs from the boarding area to the unloading area.
The reason for the accessible boarding area is to have guests with wheelchairs and ECVs board in the same area that they will unload at. They park their ECVs/wheelchairs and then get on the ride tram (there is one wheelchair spot per tram). When the ride is over, that tram unloads at the same spot it boarded at.
Being sent to the accessible boarding area doesn’t mean a shorter wait. For each tram that stops there, many trams stop at the regular boarding area. So, guests who were ahead of the wheelchair party at the pull off point will board before the guest with a wheelchair is boarded. Our longest wait at the accessible boarding area, after waiting in line first, was 40 minutes - when guests were walking as fast as they could to the ‘regular’ trams and some trams were being sent out with many empty seats.
Kali River Rapids - the regular loading and unload areas are on a large rotating disc that moves at the same speed as the boats. It is not accessible because there would be no place to put the wheelchair and the boat is not held stationary. Guests also have a limited time to transfer into and out of the boat. The pull off point for the accessible boarding area is not far before the regular line reaches the regular boarding area. The regular and Fastpass lines are accessible until that pull off point.
The accessible dock has space for wheelchair to be parked and the boat will be brought back to that dock for unloading. The accessible dock does not move and the boat is trapped there while guests load and unload; they can also take as much time as needed, which is especially important because the boat is wet and slippery.
I hope this explains why some attractions have different boarding. If guests only see either the accessible side or the regular way, it’s hard to get a picture of what is really happening and why.