Ease of movement, when every move costs time. In the kitchen business every moment of energy expenditure is a cost. The flow of the kitchen dictates the flavor. Entirely. A poorly designed space will exhaust you. Wrestle you to the ground, leaving one totally unable to speak-grasping in one hand a dirty, foul smelling hand towel and the other a set of ten inch stainless steel tongs.
Designing a commercial space is not unlike designing a space for anyone else. Having the proper continuity and flow is instrumental to the success of a proper kitchen in a commercial or personal space.