Just like a couple of other users have mentioned here, you can actually make use of the telegram notifier bot with that you can track the boards that you visit the most and also you can keep watch of a thread with the bot too andin that way you get a notification anytime someone posts on that thread it's easier for you to trace it there if you don't fancy the post history here.
That search button on your right option actually does work for me; like, I just have to click and open the thread in question and then use the search button, search my username, and I will get my result, but what I always get is about 1-2 results depending on how long the comment is.
It does work for me too but the thing is most newbies don't really know how to narrow their search using the forum generally search button so they end up getting more unneeded results than necessary.
Ninjastic space is really good too so keep track of your post history it's one very responsive site connected to Bitcointalk too.