There is a saying: amateurs talk tactics while professionals talk logistics. Enthusiasm, common sense, good-ol American know-how, and can-do spirit will get you through a situation with a small number of people. As soon as you break a dozen souls, perhaps two dozen if you have a lot of ability and a good memory, you start to need organization, documentation, and some sort of bureaucracy.
The bureaucracy needn't be large. Three people; executive, adjutant, record-keeper can cover a lot of situations. How you divide up responsibility isn't important as long as all the slots are covered.
Once you get to a disaster involving hundreds of thousands it is documentation, paperwork, that saves you. And yes, the difference between people living and dying is planning and logistics. Neither of which happen without some sort of documentation to quantify and localize the issues.