It gives you full beans in eco mode. Foot down without clicking the kick down is a long way off full throttle. I think it is more of a dsg thing tbh.
^ on a manual the 'click' allows full throttle in eco mode.
Definitely a bigger difference if you have DSG - lift off the throttle and the clutch kicks in, revs drop to idle. It is the response after that happens which is dangerous IMO.