For my part, I'm rather excited about the possibilities of image generation. I've played around with https://www.artbreeder.com for NPC and character portraits. You can feed it some images you find, and then blend different elements of pictures or adjust however you like. And, of course, if I ever get into a serious campaign where I need a lot of images I'll probably pay for Midjourney. I am continually blown away by the capabilities of it. Personally I love adding art and images to my posts, and maps. Even if it is just a portrait of who is speaking, I can't just leave a post with just text.
As for text, I just dipped my toe into that the other day, and was similarly impressed. I'm running the Reign of Winter AP and there is a bard that happened upon the players. The AP says she entertains the camp. I wanted to flesh it out more than just say "she plays a lively song and tells several tales of yore" or something. So I had ChatGPT spit out a poem. I could feed it a style, a moral, various elements, and even have it switch to rhymed verse. It started out very simple, but then I asked for more flowery language and it delivered. It was just right for providing some extra color for the players without requiring much investment from me.
I don't think I'd ever just let AI run a scene or advance the plot or anything, but I'm considerably more open to exploring what it can do after this good experience.