So, anyone who's been around M.SE very long, and has access to some of the review queues, knows that the review queues are by no means of equal activity (or busy-ness).
Close Votes is always the most active. It's not too much to say that "it's a bear". I can easily do 20 reviews a day, every day, on this queue. I've noticed that of late it's been quite a bit shorter than it was, say, a few months ago, so good work, reviewers!
Late Answers is easily the least active - I might get one review per month on that queue.
In the middle are Suggested Edits, First Posts, and Low Quality Posts.
Reopen Votes is somewhat inactive, but not nearly as inactive as Late Answers.
I've noticed that in some of the less-active queues like Reopen Votes, a number of users are getting nearly 20 reviews a day; but some of those reviewers already have well over 1k reviews in that queue. The effect is to make it far more difficult for a wider variety of people to get experience reviewing those queues. A site as large as M.SE naturally requires an enormous amount of moderation, and it's best to be continually allowing "new blood" into the system.
So my request is this: if you already have a lot of experience in a review queue, please think twice about reviewing in that queue. For example, I have a good bit of experience in Suggested Edits, First Posts, and Low Quality Posts. I've done almost no reviewing in those queues lately, because I've noticed that those queues simply don't build up. In Close Votes, despite having plenty of experience, I try to do 20 reviews a day when I can, because I've seen that queue build up to 400 - making it less useful than it might be.
[EDIT] I have removed badge language from this post, making most of the comments below less relevant.