If you're a keyboard shortcut junkie, you probably already know that there's two ways to get straight to the desktop in Windows without needing to mess around with mice — but you may not know that one is ultimately more useful than the other.
Windows has long supported using the Windows key-M shortcut to minimise all open applications (certainly since Windows 95). You can also use Windows key-D to go directly to the desktop (a shortcut I'll admit to only learning much more recently).
In immediate terms, the result might appear to be similar: the desktop appears in front of you. However, there's one crucial distinction. The minimise shortcut also places focus on the desktop itself, so you can navigate between icons using the keyboard. That doesn't happen with the desktop shortcut — you can see everything, but to actually access any of the desktop goodies, you'll need to click. (In this case, focus actually stays on the last application you were in; hitting Enter will reopen that window.)
Of course, you might still prefer the D route if you don't want all your windows minimised — but if you have to access the mouse straight after using a keyboard shortcut, that's notably less efficient. And if (like me) you prefer running applications maximised (and will end up returning to them using Alt-Tab), then there's a definite benefit in the Windows-M approach.