I am also claustrophobic as well as getting terrible motion sickness. The first time I went on Star Tours... well let's just say I was out of commission for a good 3 hours. The claustrophobia thing is not so bad, as the ceiling is fairly high, and the inside of the "car" is pretty big (I would say there are at least 15 people in there at once), but if you get motion sickness watch out. I did try it again after a few years and getting a motion sickness patch to wear (I never go to Disney without one now) and it was not so bad, but I still felt a little queasy on the way out. For claustrophobes I would say the worst ride would be mission space. I have only gone on the green side of course because of the motion sickness thing, but on that I did get very nervous because of the small space. I glad I did it once, but never again.