Generally a lot of web-dev which is where I would assume LLMs shine the best. I noted elsewhere but I think it depends a lot on the age of the product and the level of velocity. For early life products where the speed of your velocity matters, I think you can get the most benefit. The more mature the product and the slower the team implements features, the benefits are still measurable but not as high.

Ah yeah, I can totally see how it can be useful for churning put tons of code. Even without copy-paste, just generating a ton of references and rewriting/improving them. Anecdotally, I’ve tried asking deepseek to review a few files of my code — it wasn’t bad at all, though not without false positives.