I'm enjoying using state machines. Old state goes in with an Event (e.g. payment received), and a new State and a list of Effects (e.g. update balance) comes out.

I really feel that AI is improving the quality, not just the quantity, of my work. When I realize The Right Way™ to do something, my agent can just do the refactor easily.

All the quality things that some devs ignore (testing, documentation, specs, ...) are also really good at educating the agent about how to write good code