I've used it once years ago and regretted it almost immediately. Now I just avoid certain members that irritate me.
A few members blocked me. Now I don't bother with any of the threads they started. It was definitely a shock to discover it especially since my interaction with those members was minimal prior to it.
Note that anyone who has an ignore list should not start a general topic thread. -- There's plenty of evidence of members who have done this. A thread that is locked and started by a moderator is usually due to the original poster's ignore list.