I'm on the hoods more than anything, but in the drops a lot as well. It's like driving a car: you constantly scan. In a car, you aren't looking straight ahead, you are scanning your mirrors so you are aware of what's around you. On a bike, you are scanning further ahead; up close; to the sides; behind... staying attentive to any and all threats, and to sights you might enjoy enough to look a bit longer. Do I reduce the amount of time I spend looking further ahead if I'm 'hammering'. Maybe. But if I'm in the drops a whole lot, I'm probably in a group, and don't need to see quite as far ahead. Solo, I am going for the workout more than speed, and so there is less reason to be in the drops. I just do it enough when solo to make sure I'm not getting lazy about it.