I would be curious to hear your impressions of the course. You have quite a bit of experience for someone taking AOW. I don't run AOW very often and usually just for people who request me specifically but my impression is that most AOW courses I've seen are pretty superficial.
Back with my impressions of the course. Took "the course" with a dive op at a resort. As such all of the dives, except the deep dive, were planned for 45 minutes at a depth of no more than 45 ft. All of the AOW dives were completed during the regular dives (multiple groups on the boat.)
Day 1 of diving (first dive for fun, 2nd dive for AOW): As the op suggested/told us, my buddy and I did the PPB first. I found the skills staying in neutral buoyancy above the bottom, and going upside down to knock over a weight with your nose) easy enough although my buddy had a harder time hovering above the bottom. He hasn't been able to dive over the last year and a half due to a heart attack. The instructor worked with him for a few minutes while other divers in the group watched.
Day 2 (first dive for AOW, 2nd for fun): Because of circumstances, and because my goal was to expedite getting the 5 AOW dives in during the 11 that I had prepaid for, I did the BOAT dive without my buddy. Pretty simple to identify parts of the boat and identify where equipment was on the boat. Two down.
Day 3 (2 cenote dives, no AOW)
Day 4 (1st dive and 2nd dive for AOW): NAVIGATION was first. Having taught science and some basic orienteering, this was pretty easy also and made easier by completing a square using cardinal directions, but maybe tougher due to poor visibility. Straight line and reciprocal line swimming posed no problem. Next dive was NATURALIST. Had to identify vertebrates, invertebrates, and plants. Again, having taught science, and taking lots of pics while diving, I knew quite a few, but admit that plants can be hard to find. I actually enjoyed this as the dive was like a treasure hunt, although vis still wasn't good. 4 down. As we had lots of time between dives on shore, we did all of the BOOK REVIEWS and got signed off on those. For me, I pretty much perused the chapters, except for PPB, to find the answers to the reviews so I wasn't taking a lot of time on my vacation to really do a deep read.
Day 5 (night dive, no AOW)
Day 6 1st dive for AOW, 2nd for fun): These dives were done in Cozumel. The DEEP dive was to 82 ft. The skills were comparing NDL readings and observing color changes. My buddy did his boat dive on our 2nd dive. Done.
I admit that I was looking to complete the AOW so that I wouldn't be left out of rec dives below the famous 60 foot mark or prevented from entering a wreck somewhere down the line. Only looking to be proficient in the skills needed for the type of diving I do, which is mainly Caribbean settings. I would say that as far as making me think from dive to dive, the PPB was the best of the dives since it is always an important skill. Diving the cenote was one of the toughest things I've done trying to maintain the proper buoyancy throughout.
Taking a course like this, as I did, is pretty superficial, but then again these dives are really just an opportunity to try out different specialties. I think at the point I'm at in my diving life, I don't see the need to do extra dives (that may cost more money) just to do some more creative skills in the same specialty. Did observe that the other people we met also taking AOW were about 30+ years younger than us!