One of my co-workers just asked me to review his pull request that was all AI generated. 600 files were touched, over 40k lines of code added.

I'm sure he thought that was a crowning achievement, proof that AI can enable 10X developers, after all, what engineer could write 40k lines of code in a week?

I declined to review it, stating that I couldn't possibly vet 40k lines of code, and wouldn't put my reputation on the line to stamp the work as good. The PR nagged me for 2 weeks from my todo list and then disappeared. I don't know if he found another dev to get an approval from, or if the PR was abandoned. But I know for sure that him and I are on two totally separate islands around the value of LLMs.

Same here. A co-worker touched a few hundred files in a PR and asked us to review. They merged it directly to main when nobody approved it. (The repo was not set up to enforce PR approval.)

I don't personally use that feature, and I couldn't care less at this point. If our customers are frustrated by the bugs, at least my name is not on it.

That's a process problem at your company - no developer should be proposing branches over 1k loc (or whatever your agreed tolerance threshold is) without a very good reason, vibe coded or not.

I declined to review it, stating that I couldn't possibly vet 40k lines of code

Gee, that sounds like a job for Claude if there ever was one.