Unless it's the most rudimentary logic I tend to have to hold the LLM's hand through the entire design. Sometimes that involves breaking the damn thing's fingers.

I mostly use them to write stuff that I can do but hate because the syntax is a faff (argparsers, docstrings, shite like that). There's just too much contextual knowledge needed for them to be much use with the codebase I work with, much of which is not in the codebase so much as in the metatextual knowledge needed. I write a lot of software for testing hardware and there's a needle that has to be threaded - the specifications are not bulletproof, the hardware being tested failing may be the desired outcome (so code that passes on it is inherently wrong), and there are various limitations and priorities that inform test approach.

The actual code I write is fairly minimal but the knowledge needed to write it is extensive.

Occasionally I'll take on side projects at work to get my hands dirty on something more involved but simpler.