AI coding assistance is good for the same stuff you would have put through a tool assisted service previously anyway. Regex and other forms of complex pattern matching are way easier for a computer than a human. The only difference now is that you can just write out the problem plainly instead of in tiny chunks.

I recently had to write a script to parse an nginx log for unique entries with very specific criteria that could vary depending on other criteria, and then do some crap to manipulate that data and use portions of it for API calls to other more complicated shit. Figuring out how to properly parse that data manually would be mind numbing. AI does it instantly.

That's not to say that the entire concept as a marketing ploy isn't complete bullshit, but if it were just used for the crap it's good at, it would actually be a net benefit to society.