Haven't you ever felt over-crowded with apps on your current OS? Don't you have an application that is always on no matter what, yet you don't have to use it all the time (i.e email client)? 4 Desktops gives you that the space, put the email client on a desktop, the browser on one, your multimedia on a third...and never feel overcrowded
....and its neat! been using it for 2 years now 
