I play D&D Miniatures Skirmish, although not with any sort of regularity. I did go to the European Championship, so I guess I can't really consider myself a casual player...
I got off the Games Workshop treadmill.
I used to play much Star Fleet Battles, but that's so "been done" to me.
There are some games I'd play again if I had the chance (Silent Death, anyone?). But I never do, and don't find it's worth going out of my way to do so.
Yes, but rarely. The last was probably HeroClix (great superhero bash 'em up fun). Started with wargames as well: Panzerblitz IIRC was my gateway game. Would like to play some Squad Leader, Titan or Battlefleet Mars if I could find some takers.
Yes, though not often, and less often lately. I used to be a big fan of OGRE/GEV, and also played some Star Fleet Battles back in the day (as well as, once, a stab at SPI's massive "War of the Ring" wargame).