Topic on Talk:Phabricator/Help

Several places, but not a single one.

Is there a place on Phab where I can go to view my entire subscription list and unsubscribe to items I'm no longer interested in?

I don't think so. https://phabricator.wikimedia.org/maniphest/query/subscribed/ lists all tasks you are subscribed to. Your user page lists projects you are a member of. But afaik there is no way to get a list of projects that you are watching, and no place to get a list in one single place.