Somewhere during the fourth season, which ended in May, I stopped watching. Not for lack of interest; for lack of sleep and time, I simply set the DVR and recorded the episodes. Then I was getting ready to go to Sweden, then I went to Sweden, then I came home, and OMG, we're at the middle of July and I have 9 episodes of Supernatural to catch up on.
That is, I need to park my butt in front of the television for 9 hours. Nuh-uh, ain't happenin. Not while the sun is shining, the days are long, and the garden needs tending.