Michael Lopp, explaining why the Exposé and Spaces features of Mac OS X never really caught on, and why Apple's completely re-imagined them in Lion:

How would you react if, whenever you were wondering where something was on your desktop, I’d show up, pull every single thing off it and show it to you in a manner completely different from how you organized it?

You’d yell, “Don’t touch my stuff!” because in an instant you’d realize how much organization was hidden inside your disorganization.