I must be the only person who thinks Toy Story is completely overrated as well as emotionally manipulative (particularly the third one).
I actually think Dreamworks' best >>> Pixar's best.
Obviously Pixar is much more consistent and some Dreamworks films are appalling, but How to Train Your Dragon, Shrek 2, and Kung fu Panda are unappreciated, unpretentious masterpieces, IMO.
As for 2D animation, Spirited Away is just breathtaking.
Howl's Moving Castle is great too.
As for Disney animations, I don't actually think Snow White is that great, it's just hugely influential and important. Most Disney films I've never seen, but I remember Dumbo and Pinocchio being really good, and more recently Beauty and the Beast and Tangled was great.