I can't remember for sure, but I think I was lost at first too. Then I discovered the windows key, and never looked back. I love getting most things done without touching the mouse. Though I did have to install a panel for when I work with more than a few instances of the same program at once (at which point alt tab can sometimes not allow me to differentiate between the instances as fast as I'd like).
I still think they should pop up a short tutorial when you first use it.
I still think they should pop up a short tutorial when you first use it.