I can only recall using the "Ignore" feature twice. One poster decided it would be funny to announce early results of Olympic Games (which were taking place in a distant time zone, so American audiences viewed the activities "live" after the fact if that makes sense). I blocked her so I wouldn't see what she was posting. In another case, early in the Downton Abbey series someone began creating new nicknames and spamming threads with significant spoilers (they had seen the British airings in advance of the shows we were watching in the USA.)
Otherwise, I preferred to know what people were saying, or at times I suppose I had them on "mental ignore," and I chose case-by-case whether or not to reply. Just because we haven't "clicked" with someone in the past doesn't mean we won't find common ground in the future -- and if we don't see their posts, how will we ever know?
But I do understand that's only my preference. After losing the feature and reading all the subsequent posts over the past nearly 2 years, and seeing what's happening without it, I do think some of the arguments wouldn't happen if posters could block others. Just because some of us don't want to use it isn't a good reason not to offer it to those who would like to. I think it's very, very strange that even the basic, bare-bones version of this forum software doesn't have an "Ignore User" option
Few things reveal your intellect and your generosity of spirit—the parallel powers of your heart and mind—better than how you give feedback.~Maria Popova