I don't know if I'm on anyone's ignore list, but no one is on mine. A lot of threads wouldn't make sense if certain people were "ignored," and I really want to hear opinions from every segment of the HW community.
Having said that, although I don't ignore individual posters, I do tend to ignore some of the preachy, didactic, I'm-gonna-tell-you-how-you-should-live-your-life threads. I can get authoritative advice on those issues from my medical professionals.
I prefer to read the threads from new posters, or from the folks who are having a problem and need a community shoulder to lean on, or those that inject a bit of humor to brighten the day.
I've had my share of disagreements, but have tried to avoid those in recent months (a Lenten resolution). It's just not worth it, and it really doesn't bring any sense of satisfaction, though I do think it's important that newcomers to the site occasionally see that current members don't all agree on topics such as overtreatment, overscreening, and so forth.
I think we also evolve as we participate here. As an example, when Davidg first started posting, I disagreed with many things he had to say, just as I had problems with his comments about his particular surgeon. As the months have rolled by, I now find myself understanding his point of view and I respect him for it. We're a generation apart in some of our thinking, but so are my son and I. I'm glad I didn't hit that "ignore" button.