Just realized there are several handy keyboard shortcuts on Google Maps. Feel free to add to this list.
Arrow keys: simple, accelerated navigation. The longer you hold the key down, the faster you go (to a limit, might be based on your connection speed?)
Home/End (Fn+Arrow R&L on Mac): move about 3/4 of a page West and East
Page up/down (Fn+Arrow Up & Down on Mac): move about 3/4 page North and South
Equals/Plus key (=/+) (no shift needed): Zoom in
Minus key (-): Zoom out
Forward slash (/): Puts the focus on the search box