On the pull request page (/pullrequests), there should be a way to only show *actionable* pull requests (i.e., ones for which I haven't changed my status to "Approved" or "Waiting"). For example, by adding a tab called "Actionable" to the currently existing tabs (Mine, Active, Completed, Abandoned) (see attached picture).
Amy Glaves commented
It would be nice to filter by updated date. I have some team members that let old pull requests linger for months. :)