I bought the higher end matte version for peace at mind and the fact that it is my desktop replacement. It also feels a bit more future proof than the base version. (I use to have a base model 24" iMac and always had a little buyers remorse for not springing for the higher end)
The "creative' part of me bought it for use with Serato Scratch Live, and I'm debating whether or not I want Pro-Tools just to make my own remix's/mash up's (when I can't do it on-the-fly via Scratch Live). I plan to do a little casual photography here and there and make my own prints, nothing at all professional but I still chose the matte based on more accurate colors and the fact that the 15" glossy doesn't tend to do well if you're constantly on the go (lighting always changing). Meh, I plan on doing a lot of things with this notebook, haha
Like edit home videos also, nothing HD though...
I'm a casual PC gamer as well, solely Counter-Strike
and eventually
maybe Starcraft 2 ;p
I'm also hoping when I do get this 42" 1080p TV the MBP will be able to play recorded hdtv via the dvi output (at decent quality, because I heard there is some loss going from dvi to hdmi).