Yeah, I've been annoyed by that too (not that I've not been guilty of it myself). We should probably tell people not to add themselves as reviewers unless they're actively planning to review soon, because it discourages other people from reviewing the same item. Maybe also, when a patch gets moved to the next CF, we should drop all reviewers (ie make them sign up afresh if they're still interested).
+1 on that one. It's not because you had time on the previous commit fest that you'll have time for the next.