I find LLMs are good at essentially boilerplate code. It's clear what to do and it needs to be typed in. Or areas where I really have no idea where to start, because I'm not familiar with the codebase.

I find anything else, I spend more time coaxing them into doing 85% of what I need that I'm better off doing it myself.

So they're not useless but there's only so many times in a week that I need a function to pretty-print a table in some fashion. And the code they write on anything more complex than a snippet is usually written poorly enough that it's a write-once-never-touch-again situation. If the code needs to be solid, maintainable, testable, correct (and these are kind of minimal requirements in my book) then LLMs make little impact on my productivity.

They're still an improvement on Google and Stack exchange, but again - only gets you so far.

YMMV