I can see that. I mean, I don't really have a friending/personal journal over here - all my friends are on LJ/Inksome - but I guess you could say I use my CDJ to keep on top of things. I also have a journal here for venting/lurking.
And I have to admit, I'm guilty of the latter. I don't do it intentionally, but you're right. I sometimes recognize people more by their journal/AIM names. But I do try my best to learn their actual names [if they share them] just because, to me, it makes them seem more like a real person rather than just an RPing entity. If that makes any sense.