Okay, I confess, at this point I hardly ever remember to use this feature. It seemed reasonable to switch it on... our community is growing awfully fast and it's just kind of hard to keep track of who's who. But maybe the feature isn't a good fit for us.
It's the sort of feature that just doesn't work at all unless it's used frequently. I'm not sure our userbase is made up of people who are likely to use it. (As opposed to boards that attract mostly techies etc...)
Never heard of it and don't care?