Power users have grown up, but we'll see in the next few years whether or not the typical user will miss those metaphors or not. They seems to be taking the Windows 8 switch from the desktop ok.
Average Joe users that I know (that just happened to buy new computers after Win8 came out) are going insane every day to this day about their "behated" Win8 experience.
If anything, Win8 has driven even more casual non-power users to Android tablets... rather than to WinRT, that is ;)