Making script is cool thing, but as you already noticed there is watchlist for such things. But personally my choice usually is "Show replies to your posts" or I'm just going to specific boards to find something interested.
The problem with "Show new replies to your posts." is that the list keeps growing. Even topics I posted in years ago still keep popping up. When I started on Bitcointalk, I used it a lot. Until I read this:
Unwatching topics cleans up the list. On the first page, my Watchlist drops back to "Last post: 2020" already, so I don't see topics I'm no longer interested in on top.