I was thinking about some of the things said in this post regarding the Close View Queue size and how so many questions seem surmountable. You've already given us a way to break down that queue into smaller chunks by allowing us to filter it, but we have no idea if the section we're trying to "clean up" is 3 posts or 30,000.
Could you add a number somewhere to the Review screen showing us how many posts there are to review in our filtered Review Queue?
(Ideally, a date range filter option would be nice too, to allow us to further break down the queue into manageable sizes for a single person to clear on their own)
Edit: Based on the success and some of the comments on this event when the Close Vote Queue was temporarily reduced in size and a post created to list the top Tags and Count of posts, I think this would help increase participation of reviewers in the Close Vote Queue a lot.