ChatGPT has been a lifeline for me as a GM with little spare time to prep and far too grand ambitions for the scale and scope of (D&D) campaign I want to run. I'm curious how other GMs have found ChatGPT and similar AI tools useful or helpful in running their own games. I'll share my own workflow below as a comment, and I hope others find it useful. I'm especially interested in any ChatGPT prompts you have found worthwhile, and you can see some of my own prompts in the examples I'll share shortly.
I'm a big fan of @slyflourish@ttrpg.network's trick of preparing secrets, clues, or general plot point revelations in advance and without anticipating the context of where or how they will be revealed. That is, you just prepare a list of ten facts or details that will engage the players if and when they learn them, and you improvise how they learn them at the table. It's great for when a player character unexpectedly goes to the library to aimlessly look for clues, or the PCs start talking with an NPC and you need to drop some nugget of info to make the conversation feel worthwhile.
https://slyflourish.com/sharing_secrets.html