One feature I love about Apple’s office clones (Pages, Numbers and the mighty Keynote) is their gesture integration, including pinch to zoom. This gesture is very intuitive and makes document navigation much easier that modifier key-scrolling which tends to be confusing.
But until today, I didn’t realise that there was any shortcut for zooming Word documents. It’s not as nice as pinch to zoom, but still very, very useful. Use the wheel on your mouse or a two-finger scroll gesture (no, not that one).