I'm a very casual player.  I don't build huge structures.  I like to mine, and build small homes.  I like to try and be creative by maybe using colored wool, or by building in the side of a steep cliff., or some other ways.  I mostly want to join the server to chat while I play minecraft.  I like joining servers to see what other people can create/build.
I work and go to school full time, and my wife is pregnant, so I can't play all that much, but I like to play some nights before I go to bed.