I haven't personally used a coding assistant yet, but I've asked CoPilot to write me some code on several occasions, and it has been an absolute boon. It has done in mere seconds what would have taken me hours the "old way". And sure, I have to check the code for correctness, but that's still orders of magnitude faster than writing the code from scratch. I (the human) become the verifier, in this mode.

ooh, here's a good article I found on the subject: Best practices for pair programming with AI assistants