Favorite hotel I've never stayed at is the Yacht Club, but for senior week next year I'll probably be staying there. Holla! (Sorry, everyone at my school says that and it's rubbing off on me lol)
In terms of the hotel alone, definitely the Animal Kingdom Lodge. It just has an atmosphere about it that is so wonderful.
But I also love the whole Yacht/Beach/Boardwalk area and the hotels there.