Studio One can be setup to switch from Mix window to Arrange window as per Pro Tools with one key stroke.  It also works very nice over two screens as well.

bits2tubes
 
As I under stand it SO is a one-screen UI. I always like being able to switch from Edit to Mix screens in Plat. Don't know if I'd like the one screen only idea?

You can detach the console from the docked position in the lower area (click on the little angled arrow icon on the console), and resize it or drag it to another monitor.  If you are only working with one screen, you can resize it to full screen, then toggle the view off/on with the F3 key.  Instant edit or mix with one key.  Works very well!

+1 to the above with SO. I had the same reaction when I first read about the single page UI, but you are not limited to such.