As someone in IT I have mixed feeling about this. Linux machines make great servers, ok workstations, and God awful corporate endpoints. Say what you will about Microsoft and windows, when you need to manage policies impacting large number of endpoints, active directory (when configured correctly) is a beast of a solution.

Now if we are talking about someone at home browsing the web? Use whatever gui/os you like. I do agree, more people should try Linux just to be exposed to something different.