Two things to add to this: 1) A way to mitigate the risk of winding up with a camera sitting on the shelf is to start off with a used SLR from a few years ago. If, six months in, you don't like it, you can almost surely get your money back out of it on Craigslist.

2) As to bringing it everywhere, this quote from Jay Maisel jumps to mind: "You should always carry your camera with you because it’s easier to take pictures that way." Just depends on the attitude I guess. That said, I completely agree with the documentarian comment - if you become "that guy" (the photographer), you have to consciously remember to participate in things like family events, and not just shoot them. It sounds ridiculous, but it's true.