I think its also because in this age of DVD for the past 10 years, I prefer to watch shows for the first time via DVD too. No commercials every five seconds, no waiting the whole week (or longer) for the next episode, no waiting all summer to start the next season, you can actually watch the credits without it being squeezed up for ads or some announcer talking all over it, watch it whenever you want at any time of day etc etc etc
It completely changes the way an episode is presented, though. A big surprising shock before a commercial break is supposed to have a break of anticipation before you continue. An episode has a cliffhanger that gives you a week to think and discuss it. Seasons end with big moments that you have to wait months to see resolved.
Granted, this is annoying, but it is how the episode was originally designed to be presented.