I treat LLM based coding assistant as a fast and obedient intern, I give it easy but tedious work like unit tests or documentation or duplicating simple stuff, but I double check everything.

I also use it as a cognitive assistant, I've always found that talking about a design with a colleague helped me to think more clearly and better organize my ideas, even with very little insights from the other side. In this case the assistant is often a bit lacking on the skepticism side but it does not matter too much.