2012 is not a planetary alignment so much as an era of galactic alignment. This event happens around every 26000 years (but that's from like 1980-2016, not 2012 specifically). It's not a big deal, just a cool little thing that we get to see. All that means is that the earth and sun line up with approximately the middle of the milky way galaxy (and really, that's just a best guess).
The Maya left behind many texts, but most were destroyed and burned. There are 4 manuscripts (I think) that are left over, and not one of them mentions the destruction of the earth.
The idea of the Apocalypse is a westernized idea... just like vampires. It's silly to invest any time or effort in the idea that somehow, the date for the destruction of the earth is going to happen, and was somehow predicted by a group of central american natives.
TBH, I'd much rather believe in something cooler... like Dawn of the Dead. I could dig on some zombies.