I always thought it was kind of silly to require someone who has a high enough reputation to edit a post themselves without approval from others must get approval from others to approve someone else's suggested edit. One of these days I'll be bored enough to go look for why that is still a thing.
In the meantime I went to the suggested edits queue and got only 9, though presumably that's because some moderators cleaned it out. But us mere mortals are limited to reviewing 20 of them per day, so unless a lot of people go into review, they will languish.
(Update a day later: And those I reviewed yesterday are just now getting that second approval this morning.)
The problem is, there's little reason for anyone to go review things, except perhaps out of sheer altruism, and there's very little gamification on reviews either. I'm not sure this has a good solution, though I can think of some really bad solutions.