Although FOSS alternatives keep getting better, they are still (generally) not as easy to set up and use as commercial alternative.
I see it's been years since you used any FOSS. Installing Gimp or Open Office or Firefox or Audacity on a Windows machine is exactly like installing Photoshop or MS Office or EAC on the same machine; I have all that open source software installed on this Windows 7 machine. The installations for FOSS and proprietary are identical.
Easier to use? Yes, if you're used to Photoshop, GIMP is a pain in the ass but OTOH if you're used to GIMP Photoshop is just as big a pain. Plus, with FOSS you don't have that productivity-killing ribbon.
And installing FOSS on a Linux computer is even easier. Go to the software you want (from your distro's repository), click once and enter a sudo password, done. You don't even have to reboot.
How you got modded up is beyond me because you're 100% wrong. MS employees have lots of mod points today, I guess.