Yes -- Disqus does essentially the same thing, but instead of "Parent," it says, "In reply to AstroCJ" -- and that hyperlinks to the comment. Not a vast difference, but if you've been reading through a string of comments that's, say, 30 comments long. There's a top thread, 5 second level threads, and the rest of the 24 comments are between 3-6 levels deep as people respond to each other.

I just thought it might be helpful to re-see the name of the parent thread as you go down that deep. Maybe it's just me, but I sometimes forget which higher-level comment started all the commotion and have to go back up to look. If I saw the name, I might not even have to click it -- that'd be enough to remind me.