I'm one of those people with a bajillion unread emails -- 15,615 at the moment, but I feel like this is manufacturing a problem I don't have. Inbox zero or whatever does nothing for me. Here's like a sample of things I haven't bothered to click: "YMCA membership survey", "Recommended coursera courses", "grubhub order", "Mailing list update for a blog I read sometimes". These aren't really things I feel any sort of pressure to read, but I haven't put in a filter on them either because sometimes I want to see them. They're not really blocking me from seeing my important emails.
This notion that I'm "bad" at email or that I need to "do" something about this; why would I want to fix something that's working pretty much exactly how I want?
I could go mark them read even though I haven't read them and don't momentarily care to, but that only holds value to me if you assume that I view my unread email counter like some sort of unfinished task list -- which I don't. It's literally just a measure of things I haven't read. It means nothing to me.