I don't know that I do see an "advantage", per se. I do tend to find all the navigational stuff that people include on sites to be overdone though.
I'm optimistic, (and that's probably a bad thing, since Im let down at every turn in my expectations), that people can manage their way back to the front page of just about any site, so me personally, I use the "header goes home" link and let it be.
Also, I have to say, I think it "looks" dumb to have a go home link in any sidebar.. If a navigation menu is at the top of the page, it makes more sense, visibly, for me. Thats just a personal preference though.