I voted yes. My name is not actually in my profile, but I've used the same username everywhere since the early 90s, and the briefest of searches would pull up my real name pretty damned fast.
Same -- I have used shortstuffsushi for every account since 5th grade, to set up my first AIM account (boy, that feels like forever ago). People who know me in real life are able to identify me by that handle, so if I use it, it's really no different than my real name (aside from being unique to every site I've ever visited...).
