I think this Magus quote from Chrono Trigger sums up my feelings best about the Apocalypse and any potential rapture.
"If I die, let me die. If the world ends, let it end. But if what I do causes me to vanish, I will be amused."
It was said among one of the many endings to that game, and sounds pretty badass. Said before he takes on Lavos solo in his uninterrupted pursuit through Zeal's ocean palace.
Anyway, with recent events, I think the Mayans got it right when the end of the cycle means a new beginning, and the clock essentially resets itself back to the beginning (or another cycle we aren't aware of that predicts the "real end" in 6450 A.D. or some crap like that). But anyway, I think Revelations, Ragnarok, and so on's apocalyptic messages weren't meant for the common man, but instead was a warning to the governing elites to change their ways, or face consequences for their actions, and those words were spun to involve everyone else as part of a colossal indiscriminate attack from God or something so that they can have a few more last moments of control over the weak-minded types that believe everything they hear.
Oddly enough, that makes me optimistic about "The End". It's the end of the world as we know it. This world turned into a shithole. After 2012, hopefully enough people will change their ways for the better, and we'll actually improve as a whole world. The again, knowing the track record of the human race, I could be wrong.
As for what I'd be doing when the time comes, nothing really. Just throwing an Apocalypse party or hanging out online commenting on what's going on during that day. Afterwards, commenting on a sudden population boom that ensues 9 months later. At least my high school reunion the year after will be more interesting since it takes place not long after the 2012 Apocalypse times. I'd just be laughing my butt off if I notice a majority of the girls that were in my class are a few months into their pregnancies upon their arrivals.