I feel obligated to reply to this one because I don't own a TV. :) - but it wasn't a parenting choice. When I moved out on my own, around age 20, I just kinda lost interest in watching TV -from there the less I saw the more the little I did see bothered me. I just couldn't stand the advertising and the trite, simplistic, emptiness of most programming. Back then I had no plans to ever have kids.
When my hubby & I began living together he made the same transition quickly. I don't think TV is a bad thing, it's just not for us.
These days I do worry a little about my kids being exposed to some of the things that TV brings into the lives of most kids. The cultural identity most people find in it is somewhat lost on me, but I don't want to limit the kids to just my sphere. They see an average household amount of TV when they visit the grandparents & it doesn't seem to strike them as a foreign world. They know some kids TV characters from the net. noggin.com etc.
DH & I enjoy tracking down things for them to watch on the computer or from netflix.