Pixar makes very restrained and tasteful use of 3D. Nothing in your face, just an expansion of the environment. After a while you hardly even notice the effect anymore, it just becomes a part of the look of it. If it weren't for those damn glasses (especially irritating when you have to put them over real glasses in order to see) it would be almost perfect.

I saw Up in 3D when it came out, as well as the Toy Story 1 and 2 double feature, and the third one. Enjoyed all of those quite a lot, even with the glasses problem. Coraline was good that way too. But I pretty much save 3D viewing for special things only; I wouldn't want to watch movies that way on a regular basis. If they could do it without the glasses, that'd be another matter. But I still prefer the 2D look on the whole. Never did bother to see Avatar.

Now when they can do true holographic images . . . then I'll be really interested.