I actually used a website for handling feature requests and patches (lighthouseapp.com), and it worked great. But even the best tested patch for a known bug still needs review. It needs to be applied and tested locally. It needs an update to the ChangeLog. And eventually it needs to be bundled and released, each new release requiring (at minimum) some release notes and a blog post announcing it.
It was a bunch of little things that got more and more annoying. I would have loved to distribute the load across more devs, but aside from a few who would review patches on specific topics (Scott Chacon, for instance, helped with git issues), it was all me, all the time.