I'll give you a simple and silly example which could give you additional ideas. LLMs can be great for checking whether people can understand something.

One day I came up with a joke and wondered whether people would "get it". I told the joke to ChatGPT and asked it to explain it back to me. ChatGPT did a great job and nailed what's supposedly funny about the joke. I used it in an email so I have no idea whether anyone found it funny, but at least I know it wasn't too obscure. If an AI can understand a joke, there's a good chance people will understand it too.

This might not be super useful but demonstrates that LLMs aren't only about generating text for copy-and-paste or retrieving information. It's "someone" you can bounce ideas with, ask opinions and that's how I use it most frequently.