If you want proof that desktop applications are second-class citizens in Windows 8, look no further than the Switcher menu where you'll find separate thumbnails for all of your open Windows 8 applications. The entire desktop gets just one thumbnail, though, no matter how many different programs are running on it.
if you want to find to a program that's running on the desktop, you must navigate from the Switcher menu back to the desktop and look at the windows or taskbar there, a huge waste of time and mental energy.
The good news is that you can switch between all of your tasks using the good old-fashioned ALT Tab key combination. Also, if you dock the desktop next to your primary app in the Metro UI, you'll see a list of tiles representing all of your open desktop apps.