I don't remember harvey, but yes I remember roget. There was also drchris and cwdrover123.
To be fair, puzzleking123 does sometimes return- although I don't think he's ever acknowledged my answers or responded to my requests for clarification.
I've bent over backwards to help sweetwoman23, usually correcting one or more incorrect letters in her anagram, but I don't recall ever getting an acknowledgement/answer. But I suppose it's not compulsory.