For Batman, getting into position is crucial when time is of the essence, or a need to surprise foes is required. His Line Launcher often lets him do just that, as it'll launch on to items, then let Batman dangle, or even sit, on the line until he is needed.
Because of this, he always has a tactical advantage on foes who are simply standing or walking around, as they'll never think to look up. And if they hear something above them? It's probably too late.