tl;dr Show us how many review items are left matching a filter.
With the unusually high number of items in the close vote review queue, it is kind of getting demoralizing to review them (which doesn't help!)
Why is it demoralizing? You don't feel like you're making a difference!
To combat this psychological problem with reviews, I suggest that we show, to the number, how many review items are left when filtering the queue.
For example, when I am reviewing close votes tagged with [xcode], it would be nice to see exactly how many items are left - and see a reduction when I cast that fifth vote on an item.
It would also make the big number on the /review page seem less huge. I could say, 'Hey! Only 445 Xcode items left! That's down from yesterday! I can make a difference!'
Ultimately, Stack Exchange operates on people wanting to help. If we can show people (or at least make them think) that they are making a difference, they will want to help more. Simple.