Many developers would be glad to have 75 pull requests a day on their open source projects, it doesn't seem to make sense to complain about it. I can understand his frustration but maybe he just needs to delegate more work, give commit access, find reliable moderators, etc. it shouldn't be that hard with so much interest in the project.
While these are excellent suggestions, if you check out the links he makes to other posts there is a LOT of noise in there that he has to wade through, weigh (open/close/discuss) and take action on. My interpretation of it is that he is lamenting how the issues list has become a catch-all for everything from bug fixes (which are fine) to random non-Backbone related development questions, and looking at the issues at…
Let someone else close issues that are offtopic or a bad idea. He insists that this means that 'you have more people who have to read everything' but it absolutely does not. It means you need to learn to trust that if so-and-so closed it, it should be closed.