I believe the mistake people use with copilot is that they attempt to write large projects or functions when they lack the knowledge base of the underlying technology.

I prefer to use it as more of an autocomplete on a line per line basis when writing new code.

Typically, I use it for small and concise chunks of code that I already fully understand, but save me time. Things like "Here's 30 lines of text, give me a regex that will match them all" or "Unroll/rewrite this loop utilizing bit shifting".

I also use copilot as a teacher. Like to quickly grok assembly code or code in languages that I do not use everyday. Or having a back and forth conversation with copilot chat on a specific technology I want to use and don't fully understand. Copilot chat makes an excellent rubber duck when working through issues.