I am decent at drawing people but I am not good at drawing scenery, let alone maps. The exercise for 30 Days of Worldbuilding required me to draw a map. The map helped me think of where the resources for my fantasy world was set. Where the humans can cut down trees, run into merpeople, or even find "lost" treasure.
Even though I have no intention of putting a map with my Ebook, the exercise does allow me to think figure out the locations of my fantasy world's races, buildings, and land/oceans capes.