I've never used virtual desktops, the Alt-Tab (Command-tab for fruit-pickers) task switching achieves the same thing for me. I do, however, work with two monitors, though - a big one for what I'm working on, and a small one for email and other "office" tasks.
I'm interested to have a look at Windows 10... actually, as this weekend is a long one here, and I've no plans, I might try and get it up and running in a VM.
(I use 8.1RT a lot on a Surface 2 in the living room - it makes a great web-browsing, email and Netflix machine, which is all I need there)
... a 3.5" disk is precisely 90mm wide. The design was originally Japanese (Sony, I think). Anyone remember the 3.0" disks Amstrad used to sell? Also Japanese, they came about because Sony's 3.5" design wouldn't fit into a standard Japanese business envelope...