I've always taken advantage of ignore lists when they are available on a forum. The only thing I don't like about the one here is that you can still see where there is a post by them. On other forums, there's absolutely no trace. And of course, you can still see their posts if somebody quotes them, but sometimes I don't even notice. However, the ignore feature exists for a reason, so I will use it if I feel the need to.
For the record, I only have one person on there right now.
This!
I was pretty upset when I first used it and the ignored didn't just vanish. I remember going into one thread where two of my ignored were posting and they basically took up a whole page. I think I only saw two posts on the whole thing, not what I was expecting.