I have. And I'm sure others have too. I dare say there are many who probably _shouldn't_ be using it because of privacy/IP concerns and so you won't hear about them.
> cute novelty [...]
I thought the same not so long ago. But gpt4 for me was a game changer. It's helped me debug and fix some legitimately complex code, and has been awesome at wholesale refactoring modules to fulfil a new purpose. E.g. today I wanted help reconciling between runtime and persistent LRU cache stuff. And it understood what I wanted and assisted. After a few nudges it gave me a refactored module with comments and a few tests. It's like having a very capable junior dev in one's pocket :P
Ps. Trust me: it's not long before we have ai coding bots that grab open tickets and hammer together PRs with full testing suites. I imagine it's already happening.