While at Microsoft, I did a stint as an accessibility lead. No better way to find some accessibility bugs than to hide the mouse in a drawer for a few days. And you can do it, because if you can't, then you need file a bug. So I got pretty darned good at Windows keyboard shortcuts. As an aside, if you do public presentations, people will comment on the fact that you rarely touch the mouse. :-)

When I flipped to Mac, I tried the same thing: get those shortcuts down until the mouse isn't necessary. I've since given up, but IIRC, it can be done but it is a lot harder. For starters, it's broken out of the box because you have to set $SETTING to be able to Tab to some controls. The menu is accessed on Windows with the Alt key. On Mac, Cmd-Opt-F2. Screenshot? PrtScn versus Cmd-Opt-Shift...something, I never can remember.