One thing in particular about interface, is having more than one way to get there.

You've got everything in the control panel, but Rclick->properties on the desktop, network, computer, etc will get you to the related config GUIs too.

Another thing I miss is using the drive letters as multiple pointers / dynamic bookmarks into the filesystem.

Such as, browse to c:\somewhere\out\there\, and then browse to d:\over\the\rainbow\, fiddle around there, and flip back and forth easily. When dealing with two regions of the same drive, subst z: c:\ does the trick

Not so much an issue these days with GUI file browsing tho ;)