@searls a concern I also have. I guess the answer is similar to how use of any other tools (e.g. StackOverflow, libraries / frameworks etc.) should be approached - with critical thinking. So far the main use I've found for it is in automating certain tasks - e.g. as an intelligent 'find and replace' tool that can generate regular expressions to transform code or data. In terms of writing code beyond very basic applications it's not particularly effective or efficient.