Oh wow, windows is finally getting that feature? Nice. As a mac user this one of these "how the hell do you not have this" features that really baffled me.
I use them when I have to work on multiple projects at once (programming). Basically, I have a desktop per project with all the documents and programms open that I need for that project. It's very convenient.
It's because the show is based off of actual science and observed behaviors, not wishful thinking.