New "Start Button" = "Show Desktop"?
The activity shown by the screenshots look just like what happens when I click the "Show Desktop" icon on my desktop PC (background icons/shortcuts visible, all applications minimised, etc). If I could set my W8 wallpaper (as apparently proposed in 8.1) to be the same as my desktop it would look very similar to what happens now on my pre-W8 PC - so what's changed?
I use the keyboard as little as possible, only typing when actually entering data - I use the mouse to launch applications & navigate files, so my first port of call for applications is the quick launch section of the task bar. If I need to get to files, or applications not quick launched, I have a shortcut to either the commonly used directory, or application on the desktop (either usefully to the side of my screen, with applications NOT full screen, or quickly available on Show Desktop if under a window). If not there (or I need to access a system function), I navigate by the Start Menu - Programs - or Settings (I do use Classic mode - I much prefer the Win2K interface).
I see no benefit from the TIFKAM interface to my way of working with multiple applications open and not only accessible, but also visible - I find a partially visible window more efficient than one minimised or on some list - but I do admit that I do not have lots (i.e. > 10) of windows open at one time.