Not me. I think things like the Mayan calendar are interesting but there isn't enough proof for anything to end. Thats like believing in Religion. I think things will end when the sun goes or we get hit by some space debris. As far as all these human prophecies, thats exactly what they are human beliefs.
Sometimes I wonder where we come from and what we are and it drives me crazy. Then sometimes I believe life is pointless. We are as meaningless as a tree or a cat. That just makes everything in this life important. We need to strive to be our best because we don't want to waste the one life that we "know" we have. Interesting interesting.