Last year my 2 DS loved Buzz Lightyear (when you get off the ride, you can stand in "jail" with Zurg, he loved that!). Pooh, Peter Pan, Small World are big hits.... he isn't scared of anything so we did Haunted Mansion and Pirates also (which he loved!). Jungle Cruise was a big hit. He loved the magic carpets.
Avoid the Swiss treehouse, too many stairs for little kids.
Characters are a big draw at that age, Buzz lightyear meets in the back of futureland with little waits.
We are going to try and get over to Tom Sawyer's Island this year, I haven't been since I was little!