Raaid, I hate to kind of shower on your parade here, but we most certainly DO see the stereoscopic effect you get in a 3d movie in reality (its why 3d movies are even possible - each eye gets a different picture and our brain figures out distance from the differing perspectives) but not only that, as you have found out, our brain also gets a lot of other cues from our bodies and eyes, even 2d images, and is able to get distance information from that.
So in reality, our depth perception might not SEEM as obvious or fancy as a 3d movie, but thats because its so effective and all pervasive that we dont appreciate it as much anymore - we just see and intuitively know how far away things are.
No 3d movie or game or mental trickery on 2d images equals our eyes in actual 3 dimensional space.
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