I would spend almost 12 hours every Sunday watching football, now I may spend a few hours watching NFL red zone. I follow the scores in baseball a bit and may watch a few of the playoff games, and I just got bored with the NBA. With football I just can't take all the commercials - they shortened the actual playing time by keeping the clock running, but the games have gone from about 2 hrs when I first started watching to 3.5 hrs now - so basically an extra 1.5 hours of commercials. Score, commercial, kick-off, commercial, etc. I find it funny during the afternoon games there are often times on Red Zone when all three or four late games are in commercial breaks at the same time.
I still watch football - on tape delay. Lots of fast-forwarding (I watch everything - even WBB - that way). Can't think of a commercial I "need" to see.
I do enjoy NFL football, and we watch quite a bit on Sundays (NFL Sunday Ticket) but not to the exclusion of doing other things at the same time. I pay slightly more attention to the game on TV if it involves a team I like, less if it is a blowout (and talk about the NY Giants if you want to know pain).
Never did watch the NBA, probably would enjoy hockey but haven't followed in over 30 years. Which leaves baseball. Which I might enjoy on occasion, but except for following scores, standings and playoff results, I find I rarely watch.
PS - don't watch any individual sports - golf, tennis, auto racing, etc.
I won't condemn the pro-leagues per se, as the only major thing I find objectionable is the tendency to celebrate making a good play like you just won the championship. And even more objectionable when the good play is made while your team is getting blown out, and the player is dancing and pointing to the sky and wagging his finger. That DOES turn me off.