It's hard to monitor for us because we have to travel 15 miles out to the barrier reef, but we don't hit any spot more frequently than once every month or so. What we don't know, other than by observing the fish behavior once we see them, is how recently someone else was hunting there.
If you dive in front of your house on the same spot every day the fish are very familiar with you.
And as you mentioned, more than a few times I've shot a jack or some less desirable fish, and as I'm taking it off the shaft and gutting it, three large cuberas or dogs will swim right up and watch, almost at arms length. But as I reload, they go, "uh oh.."....and are gone in a flash.
The Philippines is different because the fishing pressure there is as intense as anywhere. 80 million people in an area the size of Arizona.....and they love to eat fish. I have watched Jake dive down there....40 feet or so, and EVERY fish just bolted in all directions. EVERY ONE. Amazing.
Oh, mirrored masks may be good for clear, blue water hunting, but looking for fish at 50 to 70 feet down....can't see them. I have a mirrored mask that is still like new after......7 years? Never gets used.