I've used chatgpt and gemini to build some simple powershell scripts for use in intune deployments. They've been fairly simple scripts. Very few have of them have been workable solutions out of the box, and they've often filled with hallucinated cmdlets that don't exist or are part of a thirdparty module that it doesn't tell me needs to be installed. It's not useless tho, because I am a lousy programmer its been good to give me a skeleton for which I can build a working script off of and debug myself.
I reiterate that I am a lousy programmer, but it has sped up my deployments because I haven't had to work from scratch. 5/10 its saved me a half hour here and there.
I'm a good programmer and I still find LLMs to be great for banging out python scripts to handle one-off tasks. I usually use Copilot, it seems best for that sort of thing. Often the first version of the script will have a bug or misunderstanding in it, but all you need to do is tell the LLM what it did wrong or paste the text of the exception into the chat and it'll usually fix its own mistakes quite well.
I could write those scripts myself by hand if I wanted to, but they'd take a lot longer and I'd be spending my time on boring stuff. Why not let a machine do the boring stuff? That's why we have technology.