I saw it again this evening with my buddy in 3D. Third time I've seen the movie inside of a week and likely the last time I'll see it in theaters. I don't think the 3D added much but as others has said it didn't take much away either.
My problem with 3D glasses is that I wear eyeglasses anyway so my regular glasses' frames get pressed in more by the 3D glasses causing some discomfort and even a touch of pain in my temples just from the pressure of two layers of rims.
The movie remains awesome, BTW. I look forward to a BluRay of it.