Right, that's my point. When you're parking with your hood-in, it may be faster initially, but it takes longer when you're leaving. The reverse is true when you're parking trunk-in. But you also get the other benefits of parking trunk-in, like visibility and being able to get into tighter spaces. Visibility is also just more important when you're leaving the spot, since y'know, pedestrians and traffic are easier to see.
But then you also fix / alleviate traffic flow when you go to leave the spot. It's a two-part process.