Is there a way to see a list of threads that you are following/watching at one place?

I believe that when there is an additional comment to any thread you're watching it will show up on your homepage.
The list of forums that you watch show there as well.

edit: Sorry, I think I initially misunderstood your query. No, I don't know of any other place that all the threads you watch will come up, all together, as one list. They'll just show when comments are added.

Found it! You have to go to your profile page, select "view posts made by <your avatar>" and then "view your thread watcher." I would suggest using an easier route.

Guess I hadn't looked there...

Thank you for replying though. An update: you can go to the upper left corner of any page and select the best icon that looks like two balloons with text. It will take you directly to the "view posts made by <your avatar>" where you then find your view your thread watcher.