Just today I needed a pdf with filler english text, not lorem. ChatGPT was perfect for that. Other times when I'm writing something I use it to check grammar. It's way better at it than grammarly imo, and faster and makes the decisions for me BUT PROOF-READ IT. if you really fuck the tenses up it won't know how to correct it, it'll make things up. Besides these: text manipulation. I could learn vim, write a script, or I could just copy "remove the special characters" enter -> done.
I use perplexity for syntax. I don't code with it, but it's the perfect one stop shop for "how does this work in this lang again" when coding. For advanced/new/unpopular APIs it's back to the olds school docs, but you could try to give it the link so it parses it for you, it's usually wonky tho.