I really dislike the Windows Shake. I have not yet been in a situation where I want to minimise all windows except for the one with primary focus. I cannot think of a generally realistic situation where I would want to. With the Windows Key shortcuts, the taskbar preview and the search feature this feature is certainly redundant for me.
However I can accidentally trigger it when comparing information from 3 windows and do so perhaps once every 2 weeks, hence my joy in finding out how to turn it off.
Does involve not just modifying the registry, but actually creating reg keys, something that is fairly uncommon unless you are manipulating your own software, but hey never knock a solution to your problems.