Most of the people saying they can "tell a difference" are using incorrect examples. When you're playing a game and the framerate drops, the game is still trying to run at the previous framerate but it can't and THAT'S why you see a big difference. It lags, at least to SOME degree.
The only way you can properly tell is to (1) use hardware that can assuredly handle 60FPS in the game you want to test with, then (2) run it with the framerate locked at 60 FPS and at 30 FPS. Even better if you can run both simultaneously, though you'd best do that with multiple machines. Try seeing a difference THEN. If you sincerely can, then I'll give it to you. But I've tested this with people - and not told them which machine was which - and they could only tell me which was which about 70% of the time (and that's including lucky guesses since it was only 50/50).
It's not as apparent as many people make it with most games.
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