I've seen it help me once so far in a way I hadn't thought of: basically, the chat completion engine was reading a bug bounty report on my behalf, and believing generic, vague claims. ChatGPT-3.5 didn't "fall" for this, but 4 did consistently.

After failing to improve performance manually, I eventually asked 4 to improve my prompt after explaining the problem and it basically added "Don't assume the existence of any examples".

This makes perfect sense in hindsight, but I had been approaching things from the other direction - directing it to only consider explicit examples in the report, and for some reason that didn't work.