Okay. But as a newbie, I still think I shouldn't need to Win+W then click on the window I need when the previous option was just clicking on the relevant icon in the taskbar directly. This is backward UI (just like the Android Jellybean which takes two taps to select an app to run just once).

It's a happy medium between user friendliness and a UI that gets out of your way like xmonad. You only need two shortcuts to use Unity effectively. Super+w to switch windows and Super+s to switch screens.