I doubt those who say they don't keep score shoot in the 60s. Or 70s, for that matter. I'd guess it's either guys who used to shoot in the 70s and now shoot in the 90s, or guys who struggle to break 100 and are just looking for the occasional heroic shot.
When I mentioned totaling earlier, I should have probably said subtotaling. I didn't mean adding up your score for one hole, I meant keeping a running total (27, 33, 38, 41, etc). I know what I score on each hole, and generally try to minimize it, save the occasional silly shot, but I often don't total them up at the end of the round.
Though I surely would if it were going to be in the 70s...