It's simple, a dentist does not walk to get a single tool. They do not lay tools on the ground while they work on you. With more work surfaces around each bay you walk less, set nothing on the floor and always have a work surface in arms reach. The end result is increased efficiency. You save walk, work, set-up and clean up time. You save motions. You save money.
In doing so you actually profit more on a daily basis. When you have 20 bays inside a single dealership, the savings and earnings can be monumental understanding time study at an average traditional shop rate of $115. per hour.