The Animation building is always a must visit for me.
This last year we took a total of 15 people to Disney for the first time. of those people 10 said that their favorite thing at all of Disney was the Animation Building (Specificly the Animator's school.... thingy.. what's it called.. .where you draw).
Something about leaving with a picture that actually looks like Goofy or Mickey. The LOVE it and want to do it again and again.