Mine liked the low key transportation stuff best; the train that goes around MK, the Tomorrowland Transport, the RiverBoat and Ferry to Tom Sawyer's Island, even the Monorail! These are not things I even had on my touring plan, but he loved the train ride so much we tried all the rest and they turned out to be his faves.
Also, the fireworks, he loves fireworks anyway, but was entranced at Wishes.