This kind of record helps the group "see what they mean." It promotes focus, understanding, creativity and out of the box thinking. Because it is visual, it provides clarity.
Because it is created on the spot, it is engaging. Because it reflects the group's own words and ideas, it creates ownership. Because it is so large, it promotes big-picture thinking. Groups become engaged and develop forward momentum much more quickly working with a graphic display than they do simply sitting around a conference table, or even working with traditional flip charts.