I was cringing right through this whole article until I hit the Quick Access Toolbar. In short I hate the Windows Ribbon UI for reasons others have mentioned. But this entire redesign was saved in my eyes by the quick access bar and the fact that you can add any function to it and collapse the ribbon out of sight. Now THIS is what Explorer has needed for years and I am actually excited about using it now. I will never have that ribbon open, it's way too cluttered and a visual mess... but give me 10 minutes and I'll have a QAT bar set up that will (on first glance) make me a VERY happy power user.
Now, we'll see what their attention to detail is when I try my favourite shortcut... Holding CTRL while clicking on the up arrow. This used to open the parent folder in a New Window and it seems that MS forgot this shortcut in recent Windows versions.