I have no problem with 3D. I don't get headaches, the glasses don't annoy me and it can be fun.
But for some reason I still watch 2D first in most movies. In the rare cases I might go see it more than once I check out the 3D version.
On top of how uncomfortable they are, they're dirty! Yuck.
Dirty? Don't the theaters give you new, sealed ones before going in?
Not everywhere, in my limited experience.
I do experience headaches and find the glasses annoying (especially the latter) and so I avoid 3D whenever possible. I don't begrudge those who like it, I just hope it doesn't become an exclusive form of presentation. However, as I was curious about the high frame rate format of the new Hobbit movie, I did go to a 3D IMAX presentation of that. The 48fps (double a standard film frame rate) presents a different aesthetic and I will have to see it on more than one occasion before forming a considered opinion on the format, but it did seem to eliminate the headache I invariably get past the 75-90 min. mark of any 3D film I've seen until now.