It is sort of like scrolling through Dribbble app mockups. The layouts look amazing as a mockup, but when you actually go to make or use the app it isn't as practical as you want.
On a desktop, with a mouse, I have near-perfect precision. I don't need overly-padded icons and windows because I have the precision of a mouse. The extra padding just wastes screen real-estate and makes me move the mouse more to get between tools or options in the menu.
I would much rather have less padding, which might not look as beautiful, and use the extra space for the content of my application as opposed to the toolbars.