Well, as my wife (jcat) already mentioned, mission space is the big one. I don't have a problem with "motion" rides (Star Tours, Body Wars, etc), and I can handle the teacups as long as a certain someone (our 5 year old daughter..... or my wife) don't start "ultra-spinning". But after riding Mission Space I just felt very bad. Worse then motion sickness, on the brink of passing out type yuckiness. So yeah, no more Mission Space for me.
Other rides I refuse to do:
Magic Kingdom:
Stitch - Need I say more?
Animal Kingdom:
Kali River Rapids - I hate being soaked - I can handle splash mountain (especially since it is my daughters favorite ride), but that ride would just get me WAY too wet.
MGM:
Indiana Jones - Yeah, hasn't changed, why bother?
Epcot:
MS (Of course)