It is amazing for typing out mock data. Say you're testing parsing of XML - it can easily suggest the the assertions over the data parsed from the XML. Example test that was 95% coming out of Copilot: https://github.com/dotnet/arcade-services/blob/61babf31dc63c...

It also predicts comments and logging messages amazingly well (you type "logger." add 7/10 times get what you want, sometimes even better), incorporating variables from the context around. This speeds up the tedious parts of programming when you are finalizing the code (adding docs + tracing).

Honestly, Copilot saves me so much time every week while turning chores into a really fun time.