No, movie spoilers don't really bother me. I avoid them if it's convenient to do so, but if, say, a film podcast has a spoiler segment for a movie I'm not going to see in the next few days, I just listen right through it. Usually, it makes me even more interested.
As for Phish, they don't write set lists in advance. They discuss and rehearse any special songs or maybe a cool transition, but most of the selections are either rotated through band members on-stage between songs, or they fall out of improvisations that have drifted toward other songs that would make for a smooth transition.
I'm with you on the spoilers. For me, a lot of what makes a good movie good isn't just what happens but HOW it unfolds.
If a movie hinges entirely on something happening without context is argue how gods it was to begin with.
I listen to BOx Office Poison regularly and love the discussion and impressions on films regardless of whether I've seen it or not, and more often than not it's "not", and in that vein it acts as a sort of discovery for films to get me interested in films I otherwise wouldn't have seen myself. Just got done with Whiplash! On the topic of spoilers though, I also listened to the episode outlining Interatellar, which was particularly spoilerific. I didn't care though and Interstellar turned out to be one of my favourite films of the year.