The one time it was helpful at work was when I used it to thank and wish a person well that left a company we work with. I couldn't come up with a good response and ChatGPT just spat real good stuff out in seconds. This is what it's really good for.
Yeah things that follow a kind of lexical "script" that you don't want to get creative with would be pretty easy to generate. Farewells, greetings, dear Johns, may he rest in peaces, etc etc