I agree as well. Presently, because of the lack of watches, the incentive is to post a new topic even if one already exists (if you don't, you may not remember to come back here to check for the answer to your question). This makes the ranch's salon less organized and thus harder to use.
As a solution, until one comes along that is built into the UBB, you can always just copy the URL of the thread you want to watch. The URL will always be the same unless the thread is moved or deleted.