Star Tours might be a bit much for you, but I don't know. It's about the size of a single bedroom in a standard house, with tiered seating.
Tower of Terror is probably another one to avoid. I've not done it myself, but it looks pretty small in there.
I want that bedroom in my house.
Seriously, it's a small moving theater with tiered seats, but my guess is that it is probably about 25 feet wide by 25 to 30 feet deep. If I remember right, each row is about 8 to 10 people and there are 5 rows.
Tower of Terror has 3 rows of tiered seats with an aisle between them. The front of the elevator is open for much of your ride. The size is probably about 18 to 20 feet square.
I am claustrophobic and have not had problems with either of those rides, although some people do.
I agree about Voyage of the Little Mermaid. It's not so much the size of the room - it's pretty big. But, it's dimly lit, with no windows and they keep making more and more people get it. Then they tell you to keep moving toward the front.
Another waiting area that is bad is It's Tough to Be a Bug. It is themed to look like you have entered the underground world of bugs. It is dimly lit, dark brown color and the ceiling is low and looks like dirt above you.
Haunted Mansion - besides the stretching room, the boarding are is dimly lit (like dark) and the line gets gradually narrower and narrower to get you to a single file line by the time you get to the boarding area. I also had problems with the ride car itself. It kind of wraps around you with a roof and sides. The audio for the ride comes out of the back of your seat, near your head. All those things together made me want to climb out in the middle of the ride.
Spaceship Earth is another attraction that I had problems with the ride car. It doesn't feel confining, but the audio coming out behind my head made me feel claustrophobic.