Hi I have the same problem, I have to go and ask a cast member to allow me to skip the first part of the haunted mansion, they walk me behind the closed in room and put me into one of the cars and you just sit and enjoy, the part that I am skipping is a medium sized room but they crowd alot of people into it and the doors close and they do a small presentation for about a min or two, then a door opens and they get on the cars, but the number of people get to me, I am still able to do the ride part.
As far as small world boat ride is I can do easy as you are in the open and lots to see it is cute, but to hubby annoying, lol. The mgm movie ride I can do because it is also not in a tunnel and fairly open but yes you have to stay in your car but lots tolook at.
In the living seas I have to ask someone to let me out as they go into an elevator to exit and I can't take the small space, so a cast member will take you down a hall and out a set of doors, most times there are ways around certain rides.
The spaceship earth in epcot might bother you also, although I have done that one in the past. Any theatre type shows that are inside a building I try to let others go ahead so that I can sit near the isle,
Hope this helps,
Deb.