Fun fact: Moderators actually have the ability to see who is ignoring us.
I ignore most people most of the time, not only here but in real life.
When that "ignore" feature first showed up, maybe five years ago, you could go to your profile and see how many people were ignoring you. I remember that 2 people were ignoring me at some point in time, although I never clicked on the number 2 to see if it showed who they were. At some later point that statistic went away. It would be useful, if we're going to have the ignore feature, to let us see who is ignoring us so that we're not wasting time trying to have conversations with them.
I've never used the ignore feature, both because I think I'm intelligent enough to ignore comments that I don't find particularly relevant without resorting to a software feature and because even the posters who annoy me most sometimes say something I find intriguing, but I have been aware of its existence for some time now. Also, I'm opposed to censorship in general and on principle. I should think that it disrupts the way one views the thread. I assume that if you "ignore" a user, then his comments don't show up in the thread. If you're trying to follow along, and a significant part of the conversation is censored, wouldn't it look strange and be hard to follow?