Earlier quoted context omitted.
I find it increases my productivity about 5-10% when working with the technologies I'm the most familiar with and use regularly (Elixir, Phoenix, JavaScript, general web dev.) But when I'm doing something unfamiliar and new, it's more like 90%. It's incredible. Recently at work, for example, I've been setting up a bunch of stuff with some new technologies and libraries that I'd never really used before. Without ChatG…
The thing is the hallucinations, I also wasted few hours trying to work on solutions with GPT where it just kept making up parameters and random functions.
You really need to be quite competent in the thing you're asking it to do in order to ferret out the hallucinations, which greatly diminishes the potency of GPT in the hands of someone who has no knowledge of the relevant language/runtime/problem domain/etc.