I certified in 1992 through Sports Chalet. I remember over a few years my excitement at diving changed to...well, boredom. I was diving just as I was taught--jump in, swim around, come up with 500 psi. My instructors knew little more than I did. Because I had nothing to work on, it became repetitive. This was before, obviously the internet, ScubaBoard, or that thing called technical diving.
I think the scope of diving now has both widened and deepened over those days-- or maybe it did for me. There are now better ways to dive, should one wish to do so. There are also higher levels to aspire to (should time and family obligations ever permit.)
Before, I would think nothing of kneeling in the sand--hell, we all did! Now, I try not to just slop through the water. I am very concerned about buoyancy, trim, and HOW diving should be done. I'm always working on my frog kick. That alone should keep me "un-plateaued" for a long while.