Well, I'm more of a Mickey Mouse fan, so my favourite Disney song would have to be 'Minnie's Yoo Hoo'. Very catchy.
As well as Friend In Me, I also like When She Loved Me (Toy Story 2). My favourite moment from that movie. Beautiful song, should've won the Oscar instead of Phil Collins. I've uploaded a video of the song if you want to be reminded:
http://www.youtube.com/watch?v=Is_hpHzEMiE