The only anime I watch the OPs and EDs at has to be Clannad + After Story. Those are the best openings and endings I've EVER seen in ANY show of ANY kind, and the series definately won me over. Nothing is ever going to top Clannad in my opinion.
Depends. If I'm watching it as it airs, then yes, definitely.
If I'm semi-marathoning something, it depends on the show. If it has a rather good OP/ED, then I'll watch em. If it doesn't, I'll watch the OP for the first of the episodes, and then the ED of the last.
Depends if I like them; if not, I skip the OP, but often can't be bothered to skip through the ED to the episode preview etc. I also tend to use that time to check email, forums and messenger before starting a new episode.
Well most cliche is the opening is Lively and the ending is a bit slow if you know what i mean so i watch mostly the opening and rarely get hit by endings I like
I almost always watch them unless the song is really annoying. Too lazy to skip unless I'm doing a marathon. I also always watch previews because sometimes there's extra scenes, etc. at the end. Though sometimes it can be annoying when there's semi-spoilers in the OP.
Usually whenever the opening starts to play, I switch windows and browse the internet while the song is playing. I only skip it when I'm in a hurry.
I do watch the OPs/EDs if it's the first time I see it or when I feel like seeing it.