Without traffic jam assist the ACC brings you to a standstill and then you touch the throttle once for it to start again and off it goes.
Only if you at rest for more than five seconds or so - less than that and it moves off again without any driver input. More time than that then you can just press the 'resume' button on the steering wheel to move off again - no need to touch the pedals at all.
This is the exact reason I went with DSG. 90% of my time is spent driving in traffic, or on non free-flowing motorways or dual carriageways and it only seems to be getting worse.
For the other 10%, there are paddles and Sport mode.