I kinda sort of agree with Sharpdiver.
The folks who can dive every week can progress much faster and it shows. I can go on a week long trip and even though I can review my work between dives, sometimes it doesn't click until the plane ride home.
After a week in Palau and some photographic disappointment in myself, I realized too late what my problem was, or rather the solution to my problem. I had trouble getting the big stuff. Sharks were either too far away, too deep, too many divers in the frame and too many stray bubbles. My tendency is to hug the wall looking for nice coral scenes, but that hurt the ability to capture the big stuff. I needed to get out in the blue more and away from other divers. I was trying to be a good boy and stick close to the group. If I were going back next weekend, it would be fresh in my mind what I needed to do.
Also, I sometimes get rushed in camera prep and do the same stupid things I've done on previous trips. I used to have a list, "A dozen ways to prevent yourself from shooting on a dive". But of course, I don't need the list anymore. Hah! It bad enough doing stupid things, but when you start cycling through the list a second time, it's really pathetic. This is where frequency of trips helps out.
I didn't include local monthly diving in my answer, because shooting bass, catfish and bluegill in pea green water doesn't really count, does it?