I don't care for rides like Space and Splash Mountain so for our family, it was easy to split up. While DH, DD11 and DS5 went on rides like that, my DS2 and I hung out together. He absolutely loved Peter Pan at the MK, also Small World, the Lion King at MK, Buzz, boat rides in Mexico and Norway, Lion King at AK, the playground at MGM, Mermaid, Beauty & the Beast. He did not like Dumbo because he was afraid of the height and he was a little afraid on the Pooh ride in the Heffalumps room. He liked interacting with characters, who were very good with him, getting down to his level and giving him hugs. The only character he didn't like was Cinderella! She was so soft spoken and gentle and squatted down and held out her hands but he wanted no part of her. Very funny.
He also liked things like the train in Germany, the water spouts in Epcot, and the dancing fountains in Epcot. He would not go into Ice Station Cool - the mist at the doorway scared him.
Some things, like Honey I shrunk and Cranium Command I know went way over his head but he sat still anyway. At the 3D movies, he wouldn't wear his glasses.