It's debatable whether using Copilot or ChatGPT actually makes programmers more productive, but I think there's a dynamic where people are so keen to prove it does (for ideological/tech enthusiast reasons) they will subconsciously work harder in order to demonstrate their greater productivity when using the tool.
This isn't sustainable in the long term but it may be enough to drive widespread LLM adoption in industry (in exchange for reduced headcount).