Our brain is split into two parts, one side is for organizer, it evaluates everything that we do and make the logical decision and evaluations. The right side is rather like a child, it wants to play and be creative not sit around filing things the illustration below shows this well.
Thinking and working visually is completely different to thinking and working with words and text. When you are working with words you are restricted for example a brainstorm as shown by one of my own below;
When you are working with a brainstorm you only write down words this its self is very draining and not inspirational at all and it is a lot harder for other people to interpret what you are thinking. Working visually not only makes it easier for people understand your thinking methods but it also helps you work smoother and more easily too.
A storyboard as shown above is a great example of working visually, there is still text to help describe things in greater detail than these storyboards can explain but the main focus of it is the images rather then the words whereas its the opposite with brainstorms.
