As I mentioned, for attractions that are continually loading, your wait will be mostly moving slowly forward. For those attractions, plan to use Fastpass or TourGuide Mike to plan for riding those when the wait is shortest. That will ensure the shortest time in line. As was mentioned, in most of those attractions, there is not a way to wait in one place and join the rest of the party. Even if there was, he would be standing there waiting, which would kind of defeat the purpose of the wait. You can always spread out your party so he has some room to move around, but usually the 'standing' time in those continual load attractions is minimal and if you know when to go or use Fastpasses, you can often walk right from the line entrance to boarding as fast as you are able without stopping.
For the attractive that load in 'batches'. One example is Mickey's Philharmagic, but all shows work in a similar way. You walk into the line until the line gets to a closed door. At that point, you stand until the door opens. How long you will stand in the first room will depend on how close you come in compared to when the door opens, so it could be anything from a few seconds to a few minutes. When that door opens, you enter another room and wait there until the door to the next door opens. The total standing time will be however long the show actually is because the reason for the standing is to gather a group of people to fill the theater for the next show.
The reason for the different rooms is so they can gather several groups separately. If it's not busy, the in-between rooms may not be in use, so you may walk thru right to the final room where doors lead into the theater. As the doors open on one side of the theater to let guests who have seen the show out, the doors to the gathering room open to let the waiting guests in. There is no way around that wait and having a GAC doesn't shorten the wait. In most cases, there is no place to sit while waiting unless the guest has a mobility device they can sit on.
Your best bet for those attractions is probably to hang back so your husband has room to walk back and forth. Those lines are usually quite wide and CMs will announce guests should keep moving to the front. There is no reason you can't hang back as long as other guests can get by you.
I'm trying to make this clear because we've had lots of posts in the past from guests with similar problems who got back and posted that the GAC did bot help them at all. The reason was that they had expectations for things that are not available and didn't understand how attractions worked.
By knowing which attractions load in batches and have fixed wait times built in for preshows and theater filling, you can plan your day and plan ways to deal with those waits. He might even want to look into a cane or something that would allow him to shift his weight more. Some people use wheelchairs and sometimes sit on them and sometimes push them to get a variety of positions.
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