But binocular vision is only one of the many ways that our brain uses to create the perception of depth... and not even the main one at that. We use the knowle

But binocular vision is only one of the many ways that our brain uses to create the perception of depth... and not even the main one at that. We use the knowledge of what covers what, the size of objects/people, and the parallax effect. The first two can already be done with 2D and the latter cannot be done in 3D either (at least not with a lot of the cheap stuff out there). Which is why it doesn't seem that big of a deal when you look at something in 3D (though surely it helps a bit).