my dd loves Epcot, she can do most things there, we skip Universe of Energy, the 3-d movies (actually all the movies) , Star Tours and Test Track, but I think that's all. She LOVES Spaceship Earth and the Imagination Ridea and is quite happy in the Land and Living Seas. I don't particularly like the Innovations pavilions myself, so we don't spend a lot of time there.
Her favorite thing though (apart from the water fountains) was World Showcase, we just really enjoy walking around, looking at everything, discovering things in hidden corners, she likes doing her mask, and we just have a really nice relaxed day there.
MGM on the other hand is harder. She likes Bear in the Big Blue House/Playhouse Disney, and Who wants to be a Millionaire.
She enjoyed Beauty and the Beast as well. That was about it. The Little Mermaid has a scary scene with Ursula that she doesn't like. I haven't tried her on the Great Movie Ride because I don't think she would like the car being hijacked. We did do the backlot tour and she was ok, but I wouldn't say she enjoyed it.
She did like the parade.
We normally visit MGM once, and the other parks many times, but I wouldn't miss it altogether.
Bev