We've stayed at ASM twice, and it's really not worth it for the "Preferred" Fantasia buildings. If you request the Toy Story or 101 Dalmations buildings, you're just as close, and in some instances, closer, than certain rooms in the Fantasia building. But all buildings are good, theming wise. It just depends on which you prefer - puppies, toys, brooms, ice hockey or racing.
The busses are OK, but that depends on how much tolerance you have for waiting. My DH couldn't stand them, so we're renting a car this time around.
Oh, and one last note of interest, if you stay in the Mighty Ducks building, it's actually closer to walk to the Music bus stops than to the Movies!