After months of having 100+ channels with nothing to watch most of the time*, I realized my main use of TV was to have something in the background as I settled down for bed. At the same time, it was a big time-sink, because I would turn it on, flip through 100+ channels to find nothing, and then flip through 100+ channels again to see if anything new had appeared (usually not), and then again, etc.
So, to save $60/month and recover about 2 hours/day, I suspended my DirecTV service and bought a digital antenna for emergency viewing. (By "emergency" I mean weather emergencies.) I can still watch series episodes by web or DVD, but that has a well-defined beginning and endpoint (as opposed to turning on the TV and just surfing around looking for something).
I've been off TV for about 2 weeks now; we'll see how much longer it lasts. ;-)
(* Notable exceptions: AMC and TCM movie marathons like James Bond, Dirty Harry, old sci-fi, etc. I'm a notorious C-SPAN devotee but I can get that over the web.)