I had no idea this thread was taking off the way it did, thanks for all the comments!
It is reassuring to hear that the learning process is continuing for even the experienced cyclists, at least for the most part. I think taking one of these clinics or finding a coach might be a really good idea.
In reality, I had one big goal this year (the PMC), with several implied goals since I had not biked before (get base fitness, learn general riding in road traffic, learn clipless, learn my bike etc etc). Once it was over I could take stock of what I learned from March to August/now, and now that I know this is something I want to continue and improve, this kind of feedback is very helpful in understanding how I can make progress. I guess, at a very high level, this thread could have been titled "what are good things to learn to be a better cyclist" and gotten similar responses. Road riding is a lot more than what I learned as a kid riding a 10 speed.
[random sidebar - I used to ride my ten speed around our neighborhood cul de sacs imagining I was a famous bike racer. This was before I knew anything about the TdF or other races, but I knew racing existed. I had a peugeot hat that I wore regularly, the ones that had the small brims. If there'd been any competitive options for me as a kid in my small town I probably would have loved that.]
It's funny some of the things mentioned here I'd stumbled upon myself, such as getting way back in my seat for uphills, shifting early and 'pacing' my gears. I hated hills at first, because I was lacking either of these techniques. Once I somehow sorted this out I actually got half decent at going up them. Other things mentioned here I don't know if I've innately done or not, like using the hips to turn thing. But it's all very interesting to realize that the opportunity for learning is great, and someone's riding can really benefit from making a bit of effort to learn.