For those wondering about whether or not the surfaces actually move or not, on the B737 (and other types) if any surface failed to move, follow up would not occur and the control check would not be 'full and free' - the controls would feel very heavy in the applicable direction and would not self centre. Just try moving the controls without hydraulic power applied to see the effect. That's why it is so important to ensure that the controls return to centre by themselves - failure to do so is an indication of possible control surface failure.