With the improvements made to replying I'm finding that I'm being quoted in threads I've never posted in (and therefore for the most part am not watching). I think there should be a mechanism for automatically watching such threads.
I don't disagree - that's why I described it as "a mechanism for automatically watching...". But there are times when I'm quoted or tagged and for whatever reason I don't reply then and there, and for that reason I think it might be better if I was automatically subscribed to the thread. YMMV