basically drill was implemented to allow soldier to get used to following orders without question from those senior to them, which is highly important on the battlefield. Rank etc and all of what some might call "bs" allows for easier organisation of forces. Obviously the more effective that is done, the quicker tasks are completed and more effectively, and the better the army. And as for those that consider all of this "bs", then it quite clearly illustrates their lack of knowledge and understanding about how a real army works.