The Human Brain

So I saw this episode of some show where they were talking about 7 wonders of the human world. One of them was a guy who could memorize thousands of numbers and repeat them flawlessly, and do math problems faster than a calculator. He was autistic, but one of the smartest people in the world. The scientific reason for this was that the different parts of his brain communicated everything with each other. So memories could be smells, numbers mental shapes, and etc. It seems to me that the human brain should always be that way. He used much more of his brain than the 10% most people are capable of using. One thing that he mentioned was that is was difficult the focus in cities due to the overload of detail that only his brain could pick up from the colors, movement, signs, and other things that modern humanity needs. I think that if thats the way our brains should work, then it would be better to simplify to a system without so much overload.