@Nika Kutsniashvili I don't think I do! :O What do you mean? Isn't this what pie menus look like on factory blender?

@Demeter Dzadik I've never seen that big white curved line following cursor (outside operators), don't think that's default

@Nika Kutsniashvili Oh, I know what it is! It's Preferences->Interface->Menus->Pie Menus->Confirm Threshold. Mine is set to 145.

I think it's kinda only useful for nested pie menus. So, if a pie menu summons a pie menu, you can make a complex gesture to go through both of them without having to click. For example, I have an Editor Switch Pie on Ctrl+Alt+S, so I can hold that key combo, drag top-right, drag down, and get a PyConsole. And this is ridiculously fast. Like, I can summon the PyConsole faster than you can say "Pie"!

I don't know if it's useful outside of a nested pie menu use case!

Also, I just discovered there is still a bit of finesse to it. It's not enough to drag your mouse past the threshold. You also have to stop moving it. But only for the briefest of moments, a single update tick, so it's still super fast.