Remember how in Leopard, Snow Leopard, and Lion, you could drag a file (or folder) from your desktop, hover it over the Finder icon in the Dock, and spring-load it down into whatever location you wanted to drop it? In Mountain Lion, you can't do this! Believe it or not, now you have to first open a Finder window... and then drag the file over the Finder icon in the Dock.... and spring-load the file into the appropriate place. Apple just took one of the most basic and most-used file management tools, and added an extra step and made the process much clunkier. Very lame.