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People using wheelchairs or ECVs don't get out of waiting in line.
Most of the lines at WDW are wheelchair accessible, so there are very few situations where someone actually goes thru a wheelchair entrance. In most cases, they wait in the same line with everyone else. For a very few attractions, there is an alternate entrace because the regular one isn't accessible and was not able to be made accessible (most in MK or Epcot since they were built before accessibility was thought of). There are some others, where the boarding area is not accessible and wheelchair/ECV users wait in the regular or Fastpass line and then are pulled into a different area for loading (Buzz Lightyear, Haunted Mansion and Splash Mountain are examples).
One of the other things that people who don't use wheelchairs don't know is where people with wheelchairs go when they are taken out of the line. They assume those people who 'disappear' from the line are boarding right away, but that is not usually the case.
If they can't board at the regular boarding spot, they are pulled out of the line - usually just before the regular line gets to the boarding area (so they have already waited as long as everyone that got in the line the same time as they did).
For example, at Buzz Lightyear, the 'pull off point' is after you have gone thru the room with the large Buzz Lightyear, near the point where regular line is beginning to enter the actual boarding area. Guests with wheelchairs/ ECVs are pulled out of line at that point and sent to the exit - not to board right away, but to wait. If there are too many people with disabilities already on the attraction, you have to wait for some to get off (for fire safetly and evacuation reasons). Because our DD can't get out of her wheelchair easily, we have to wait extra for a special car that the wheelchair can be loaded on.
We usually see the people who were right ahead of us in line getting off after riding while we are still waiting to board. In some rides, boarding at the accessible area means you miss part of the attraction; for example, at Haunted Mansion, you miss the entire 'stretching room' part of the attraction.
The Safari at AK is notorious for extra waits for people with disabilities. Our longest wait there was an EXTRA 40 minutes at a time when the regular line was walk on and Safari Trams were pulling out partially loaded because people were not walking up fast enough to fill them.
Spaceship Earth is a ride with a handicapped entrance, but during times when other passengers are able to walk right on, our wait is usually 20-30 minutes. From what I have seen, the boarding and unload area has not been changed in the rehab that is going on, so I see no reason to think this will change.
AK and the Studio were built with what are called 'Mainstream Lines'. These are lines where the regular line is wheelchair/ECV accessible and a person using a wheelchair or ECV waits in the same line with everyone else. MK and Epcot have been updated with Mainstream lines as attractions were added or renovated as much as possible.
Here's what it says in the official WDW Guidebook for Guests with Disabilities about Mainstream Lines and the list of attractions with Mainstream Queues:
As you can see, most of the lines are Mainstream Queues:
Magic Kingdom® Park
Ariel's Grotto
Astro Orbiter
Buzz Lightyear's Space Ranger Spin
Donald's Boat
Judge's Tent
Mickey's Country House
Mickey's PhilharMagic
Mike Fink Keelboats (seasonal)
Minnie's Country House
Pirates of the Caribbean
Space Mountain®
Splash Mountain®
Stitch's Great Escape!™
The Barnstormer at Goofy's Wiseacres Farm
"The Enchanted Tiki Room Under New Management"
The Hall of Presidents
The Magic Carpets of Aladdin
The Many Adventures of Winnie the Pooh
The Laugh Floor
Tomorrowland® Indy Speedway
Toontown Hall of Fame
Walt Disney's Carousel of Progress (seasonal)
Epcot®
FUTURE WORLD
Imagination!: All Attractions
Innoventions East
Innoventions West
Mission: SPACE
Test Track
The Living Seas: All Attractions
The Land: All Attractions (including Soarin')
Universe of Energy: "Ellen's Energy Adventure"
WORLD SHOWCASE
China: "Reflections of China"
France: "Impressions de France"
FriendShip Boats
Norway: Maelstrom
The American Adventure: "The American Adventure"
Disney-MGM Studios
Disney-MGM Studios Backlot Tour
Fantasmic!
Lights, Motors, Action!™ Extreme Stunt Show
Muppet*Vision 3D
Playhouse Disney - Live On Stage!
Rock 'n' Roller Coaster® Starring Aerosmith
Sounds Dangerous - Starring Drew Carey
Star Tours
The Great Movie Ride
The Magic of Disney Animation
"The Twilight Zone Tower of Terror™"
Voyage of the Little Mermaid
Walt Disney: One Man's Dream
Disney's Animal Kingdom® Theme Park
Caravan Stage: "Flights of Wonder"
DINOSAUR
Grandmother Willow's Grove: "Pocahontas and Her forest friends"
It's Tough To Be A Bug
Kali River Rapids
Expedition Everest
Kilimanjaro Safaris
Lion King Theater: "Festival of the Lion King"
Maharajah Jungle Trek
Primeval Whirl
Finding Nemo
The Boneyard
TriceraTop Spin
And, some attractions have limited number of spots for wheelchairs. We have already shown up for shows where there was still room for ambulatory people, but the wheelchair spots were already filled for that show and we had to wait for the next one. These are some we've had that problem with in the last 2 trips:
- Voyage of the Little Mermaid, where we had Fastpasses, but still had to wait for the next show
- Tiki Birds, which we could not see on our last trip
- ITTBAB, where the CMs were practically begging people to come into the queue because there was no wait in the standby line.
- American Adventure
I'd invite anyone who thinks it's so easy and there is so much special treatment to spend a day using a wheelchair or ECV and then see what you think.
Or, you could follow us on our next trip. Be prepared for up to 45 minutes for a simple bathroom stop though. We usually have to wait for the handicapped stall or Companion Restroom and then I have to lift DD in and out of her wheelchair.