I remember reading an article (in either Parade magazine or the Saturday Evening Post) just before ST:TMP came out, which said that for the first time the controls on the bridge would be coordinated to certain effects: "So when Sulu switches to 'magnification ten,' he'll have to push the same button every time!"
So said the article (which I obviously read entirely too many times back in the day).
A bit of hyperbole in those articles. There were a few "practical" buttons on the Phase II/TMP set, but not so many. In fact, some of them were hidden buttons that the actor would push without the camera seeing. You can see a pair of them on the weapons and defense station, painted black (to the right of the "accordion" buttons and along the edge of the torpedo arming controls).