I haven't watched a single 3D movie and I don't plan to, when I first saw a 3D television I looked at it and wondered "what the hell is the point of paying £900+ for the ability to watch TV in 3D" I then promptly walked out of the shop and haven't been near a 3D TV since.
Another good example of over-used 3D is with Nintendo's newly announced '3DS' I heard they would be re-releasing Ocarina of Time (My favourite N64 game) and was kind of intrigued, however yesterday I learned that they would be changing the Water temple around slightly (probably) because kids found it too hard, and by kids I mean kids these days not the 90's kids. If they change that temple (or anything else about the game) I will personally never buy a game from them again, I already dislike the Wii, Twilight Princess was nothing special and Skyward Sword looks rubbish.
In cinema's I would say 3D is being overused, mainly as a way to get more money out of a franchise.