I did know about it and have tried using it, but can not see how having to
do several operations which in the past only required one is an
improvement. It's just that having access to plain vertical navigation is
something I have used since I started using computers. Microsoft even had
that in the first UI based file manager in DOS! I even prefer to have an
"up" eleemnt above the the folder listing so I can navigate vertially
using the keyboard. You can see how that's done in Total Commander (a
popular file manager for Windows):
http://en.wikipedia.org/wiki/Image:Total_Commander.gif
If you notice the arrows on top of each pane, they take you up one level.
Makes navigation really fast. Windows Explorer doesn't have effcient
vertical navigatin in Vista at all anymore. Mac OSX and it's Next like
approach also has very efficient vertical navigation.