I haven't used Copilot but found this comment interesting. Back in the 1990s when I started programming (BASIC and C) I did maintain collections of code snippets that I used in different programs here and there. I used to cherish those snippets and dedicated a good amount of time to maintain them available through my computers.
Then the Internet and Google came around. I found that instead of me maintaining those code snippets, I could search in Excite/Altavista for how to do something, and it will be stored there for me. Later came sites like StackOverflow (expertssexchange before it) which concentrated much of that information which before was scattered in PHPBBs and Geocities pages.
Now I see this Copilot app like the evolution of that; Instead of having to manually go searching for a snippet, I imagine I can "pull it" almost automatically while I am writing code, with an AI helping me search for the right snippet with the current code context.
That doesn't sound bad at all.
Nevertheless, I haven't used it because I DON'T want my code to be sent to Microsoft or any other company. And I don't believe in adding random code for which I don't know the license! What if there is some code which was AGPL that Copilot happens to use? that's pretty bad.