I do not use LLM and I continue to work in the older way. Also, domain-specific stuff can still be useful sometimes, and other stuff involved with designing a programming language.
My experience so far is that they write mediocre code which is very often correct, and is relatively easy to review and improve. Of course I work with languages like elixir, python, typescript, and SQL - all of which LLMs are very good at.
Without a doubt I've seen a significant increase in the amount of work I can produce. As far as I can tell the defect rate in my work hasn't changed. But the way I work has, I'm now reviewing and refactoring significantly more than before and hand writing a lot less.
To be honest, I'd worry about someone's ability to compete in the job market if they resisted for much longer. With the obvious exceptions of spaces where LLMs can't be used, or have very poor performance.