This just reminds me that it's probably time for a Buffy & Angel rewatch, but my DVDs are in storage right now because I don't have space in my current apartment.
I fell in love with the show with the first episode I saw, Fear Itself, but I had a regular show (JAG) in the same timeslot that I had already been watching, so I didn't end up pursuing it. Not until FX started showing the reruns from Welcome to the Hellmouth.
I suppose when I first started watching the show, I was more eager and "rooting for more," it being a new experience for me and all, but in general, I guess I would say that "happy" would be the closest I could get from your options.
Now, if you want to ask me about Star Trek: The Next Generation or Voyager, those are "warm blanket" shows for me, comfort food.