3D: Is it necessary?

I remember, when I was growing up, that 3D was a novelty to the film that you were watching. It was more of a gimmick than anything. Granted, the movies that were offered in 3D wasn't the greatest motion pictures of all time either. Jaws 3D, Friday the 13th 3D (I think every 3rd movie of a franchise really) were the ones that stick out in my head. Soon, the novelty faded and 3D was available only for certain kids films like Spy Kids 3D(still that 3rd movie), Coraline and Adventures of Shark Boy and Lava Girl. Now since James Cameron brought Avatar to the screen to be the #1 grossing movie of all time(non inflation), the studios want the movies to be in 3D as well. I know this new era didn't start again with this movie but that's when it got popular. I was with it when it was just a novelty, here and there kinda thing. Now that almost every film is forcing 3D down your throat, I find it very annoying.  I've only seen three films in 3D at the theater: Shrek Forever After(technically a 3rd movie lol), Rio and Pirates of the Caribbean: On Stranger Tides. Only one of these films I would say was enjoyable in 3D and that was Rio. Shrek didn't really need it and Pirates showed me food and fire coming at me. Did I see the top ones in 3D? No but do I have to sit through everything shot in and/or up converted to find that out. I start to tune out a movie when it says "IN 3D" in the trailer. That gets repetitive hearing that again and again(like the point I make it this blog, i.e. the hidden 3D drinking game). We know why these movies exist in that format. It's so the studios can shake an extra $3-7 out of your pocket. I have no problem with 3D movies if you make it once in awhile and worth it. Make it unique again.