This is entirely my own empirical evidence (I worked tech support in a design house), but mac users seem to use keyboard shortcuts more than contextual menus. E.g. opening links in a new tab is command+click or alt+click, depending on the browser.

I've worked a lot with FCP (and other editing suites) and PS, and everyone I see, especially pros, seems to make heavy use of keyboard shortcuts and modifiers, rather than fishing around in menus.