I will say that Gmail seems to catch almost all of that historical sort of spam for me. But I get another 50+ emails per day (not counting those that are dumped in my spam folder--probably because enough people reported them as spam) that are various marketing because I once had a badge scanned at a show, someone bought a list of scanned badges from somewhere, I entered an email to download a doc I wanted to read, a PR pitch because I sometimes write for publications, etc.

None of this is exactly spam and I sometimes go on an unsubscribe binge (and report as spam anything without an unsubscribe) but it's still a flood of mail.