There are many watched threads, some are set to auto-watch, yet there is no option in sight to organize them. Having user based custom categories that are setup by the user is helpful in organizing their watched threads. At times it can be cumbersome if auto-watch is set, or a user simply has too many watched threads, and only keeps them as resources instead of having to search through pages and pages of the watched threads for the information they are trying to find. Also this can be accomplished through a simple search for watched threads only. Either way, both are beneficial and can increase the efficiency of watched threads.
If I read that thread correctly, the thread suggests watching a post. There is no mention of organizing threads, besides Kier's idea of browser bookmarks, or searching through watched threads, that I read. Thanks for the link to the evolving watch thread.