I find myself using ChatGPT less and less for brainstorming, but I'm using it more-and-more for time-consuming tasks.
For example, I run my games using the Obsidian note-taking app; I like to have all my spells, statblocks, etc in Obsidian so I can utilize the multiple-frame function or hover states.
Prior to ChatGPT, I would have to copy over all statblocks, magic items, spells, etc. into Obsidian using Markdown. Now, I copy/paste the statblock, throw it into ChatGPT, and say, "Convert this into markdown for Obsidian". It even knows to use the dice-rolling nomenclature, so Obsidian can automatically roll the dice for me.
TL;DR: I still find ChatGPT's creative capabilities lacking, but it has a good amount of utility in saving time on more straightforward-but-time-consuming tasks.