I don't know if this happens to many people, but often I find a nice juicy untouched question that I want to answer, I open up some development window, work on it a bit and find an answer -- only to find that someone else (usually Ray Passeur -- I'm just sayin') has beat me to the punch and posted the answer before me. Sometimes the difference is less than a minute. Sometimes it is much more.
What I'd like is something similar to the notification bell. If I am on a question page and someone posts an answer, I want some sort of notification, even if I haven't yet posted an answer. That way, I can see what they posted and if it is substantively the same as what I have, I can stop and go to another question.