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It took me a while to get my head around this concept I've played Garry's Mod modes where you have a virtual cinema, but it will be no way near the experience you'd get from the Rift.
Could you imagine a virtual cinema where you walk in, put on virtual 3D goggles, then watch a 3D film? Ok, that might blow your mind bit too much!
VR Cinema 3D for the Rift already supports 3d movies, and it works brilliantly. The only negative (as has been mentioned countless times) is the screen res of the current devkit. I can't wait to watch a movie in the next iteration of the Rift.