btw, I work in the field of user experience. I see zero usability problems with this. Any choice a user makes for his or her own interface is their choice, and if it works for them, then who is to tell them that they are wrong? It is the usability expert's job to discover how and why a person does the things they do, and not tell them how they should be doing it.

For example, have you looked at some of your coworker's desktops? Everyone sets it up differently to how they prefer to work. Some have icons littering their desktop. Some have 50 apps in their taskbar. Some people like to use spotlight. Some people like to click through folders. There will always be a better way, certainly, if they so desire, but some people just like things the way they like it. And if they're happy with that, then they're happy. And that's the most important thing.