I do that, but only if people rudely insist that I press spacebar. If you ask first if people would like to skip and nobody else in the group says they would like to watch the cutscenes, then I will skip too (assuming I have seen them) but if you just outright INSIST that I press spacebar... then yes, I very much will wait until the last second to respond. When someone assumes, they... well look it up... it's an old saying about what happens when you assume.
LOL Shame on you!! :P I've seen them enough times I just spacebar, I figure most of the wait is because someone else's computer is slower than mine.