I use AI for a lot of code. However it is only a small improvement on productivity for most tasks because reading the code and understanding it is just as hard as writing it by hand. Reading and understanding is absolutely required because AI does stupid things all the time.

Where AI is really good is finding bugs in complex code. I can now run my multi-threaded "hope to exploit a race condition" tests thousands of times. (I wish I could run thread sanitizer, but getting my entire system rebuilt for that has so far been too hard)