Use dictates design.
When you decide to grow herbs be sure you know exactly what you will be using the herbs for when you consider herb garden plans. If you are using the herbs for cooking you will want your garden designed with easy access for the every day harvest of herbs right when you are cooking. If you are growing herbs for medicinal use you will want to design the garden more in line with access to commonly used herbs up front and the less common one you will be harvesting more rarely to dry or make tincture ahead to store for clients that may need them.