Thanks for all the replies. I'm convinced that I can do 'Green' and the decision about 'Orange' will be made after that ride. I can be claustrophbic in some situations, and I know that might be an issue, but a few 'posters' on this thread who tend to not like enclosed spaces stated that they did okay. That's encouraging.
Any thoughts on the enclosed spaces concern?
I think it depends on what bothers you about them. If you don't like the idea of having things close to you or touching you, it could be bothersome. If you don't like dark spaces and the locked in feeling, I think you will be okay. I know those sound similar, but let me try this explanation. Version 1: would you feel very uncomfortable if your roller coaster car stopped safely on the brakes and just sat there, you in the restraints still for 4 minutes? If that would bother you, M:S may not be great. Version 2: If you got locked in a dark closet and couldn't get out, would that bother you? You will probably be okay (I am in group two).
A few tips:
1. One key to M:S is getting into the simulation. The projection system is good, so you really do feel like you are moving around and in the helm of a ship. Therefore, the "smallness" of the space is downplayed.
2. You also are in there with multiple people, so the loneliness factor isn't that bad.
3. Keep your head back (like you should). That can give you an extra few inches but, more importantly, it puts your line of periferal vision down the cabin, so you get the maximum space.
4. When you are in there, look around. There are a ton of buttons to play with. That way, before the simulation starts, you can keep yourself occupied flipping things and what not.