All sorts of things.
I've used it to help me tone-check emails because I have a tendency to sound a bit curt without meaning to. I'm also a waffler so I've used it to help me trim things down to be more succinct. I don't get it to write my emails for me, just offer suggestions of how I can make them better, then I edit myself as needed.
I use it for recipes when I can't be arsed thinking of something to cook for dinner or need to substitute an ingredient. Best Madeira cake I've ever made was a ChatGPT offering! It's great if you just tell it what you've got in, what vibe you're going for and how much effort you want to put in, it'll come up with ideas.
I use it when I can't think of a word but I know the meaning of the word, or if I can't remember the name of a book I read when I was a child but remember the main character, stuff like that.
I play videogames and have asked it how to do X or Y because it's easier than sifting through endless Reddit threads. I mean it basically just does the sifting part for you.
It's just important to remember it's a tool and needs human input to work properly, sometimes it'll come out with absolute garbage that needs reworking or modifying.
I will say I have also massively reduced my use of it since finding out the environmental impact it has.