I strongly support this feature request (for /tools/flagged in general). I have just recently obtained the 10k tools on SO.
I'm not really the type to blow through reviews and vote for a common flag without actually reviewing it and feeling good about the decision first. So, there are a few flag reviews that I either do not have a solid opinion on, or do not have enough knowledge about the topic to know if a flag is valid or not.
Once I collect a few of these (even just 4 or 5), they remain at the top of my flag queue. It then becomes very cumbersome to work through -- especially after leaving the page then returning to it -- to the point where I eventually just gave up and stopped reviewing flags due to the confusion (for me) and amount of effort required to constantly skip over the entries.
An implementation that I would find useful would be an additional "No Opinion" or "Skip" button. I would prefer it if it removed it from my list entirely, but it would also be effective if it grayed it out (like it does when you've already reviewed an item) or just moved it to the bottom of the queue.
It's not so much about "being satisfied with an empty list" (which is unattainable anyways given that there are more items in the queue than I have flags) as much as it is a usability / UX issue. As it stands, the workflow is a little too clogged up with flags I want to skip right now for me to continue (it's not an "I'm on strike" thing, I just can't do it, it's too hard to look at). As it stands, the only way I'd be able to keep it manageable is to add flags to posts I'd rather skip for the sole purpose of clearing them off the screen, and I know that's not the goal of the system. I don't know if I'm unique in this or not; but I am pretty sure that my response is not the intended response to the UI here.