I've found the best ways to use AI when coding are:

* Sophisticated find and replace i.e. highlight a bunch of struct initalisations and saying "Convert all these to Y". (Regex was always a PITA for this, though it is more deterministic.)

* When in an agentic workflow, treating it as a higher level than ordinary code and not so much as a simulated human. I.e. the more you ask it to do at once, the less it seems to do it well. So instead of "Implement the feature" you'd want to say "Let's make a new file and create stub functions", "Let's complete stub function 1 and have it do x", "Complete stub function 2 by first calling stub function 1 and doing Y", etc.

* Finding something in an unfamiliar codebase or asking how something was done. "Hey copilot, where are all the app's routes defined?" Best part is you can ask a bunch of questions about how a project works, all without annoying some IRC greybeard.