Basically anything that doesnt have a height req is fair game. However, I would avoid anything that is loud, or dark-if it has stuff that pops out. I have yet to take my 4 yr old on Snow White, and he hated the 3d movies (or anything with the special physical effects), & Haunted Mansion (that was his first trip when he was 2 and he doesnt want to go back to HM yet. We also avoided A Bugs Life and Tiki Room (loud noises and dark).
The hits were Playhouse Disney, Small World, Dumbo, Carousel, Indy Cars, train...He did like Fantasmic too which was a surprise since it was loud and had flashes of light.
alison