I have to disagree with the last part. If there's anything that takes someone out of a film more than having to wear stupid-looking glasses it's having to put them on and take them off on command. Either go 100% 2-D or 100% 3-D; don't go half and half.
You don't have to ask the audience to take off the glasses to switch between 2D and 3D.
I've been asking this question for 5 years and no one has given me an answer: tell me one way in which 3-D makes it possible for a filmmaker to tell a story. Name me one single aspect or storyline element of Avatar, Hugo, Harry Potter, John Carter, Gorilla at Large - I don't care - that could not be told without 3-D.
Have only seen one of those in 3D. In fact, I think I haven't seen any other 3D films, except for Toy Story 3 which I regret not seeing in 2D.
I think you're asking the wrong question here. First of all, you could probably ask the same question about colour when it was first introduced, and perhaps it took some time before some film makers started using it really creatively. Wasn't there, can't tell, but the point is – 3D is now in a fad phase, you don't really expect people to be using it creatively when the mere word “3D” is enough to yank some money? I can recall at least one director promising to use 3D in a completely novel way, but I can't remember for sure who he was.
A film is not about just telling a story, it is about eliciting emotions, putting you
in the story and driving you through it. It's not a book. And 3D can be a contributing factor to that even when it's not used “creatively”. That's what this “immersion” thing is about. To
quote Quentin Tarantino:
[yt]http://www.youtube.com/watch?v=zTZbp-fQDuI[/yt]
I think I would have enjoyed Avatar far less in 2D. I saw Hugo in 2D, and I think that it suffered a lot, but I haven't seen the 3D version to be certain. When Hugo was rushing up and down through the catacombs, like in the opening sequence, I truly missed the depth, though I could still feel how it was supposed to work.
If nothing else, 3D is another aid for the brain to keep the suspense of disbelief and also to help me with my difficulty in paying attention to the film. But only when it's in a good cinema.