(Disclaimer, I work at github)

I tried plan mode when we first added it to github copilot and it didn’t stick for me, until very recently, when I used it the way you describe. I was just putting it too early in the process, turns out I have to do a bit of exploration and discovery on my own and most of the time I can skip plan but now I have an intuition for when to engage it so it can interview me to clarify the last few things it needs before implementation. This also made autopilot mode work a lot better for me.