If you imagine working in a kitchen then you will note that you generally are working from multiple surfaces at once. For instance you might be chopping some food while cooking other food, or you might preparing a bowl of relish – keeping the bowl on one of your base cabinets while meanwhile chopping another. If you don't have enough reachable surfaces then you'll constantly be traveling up and down the kitchen – which isn't practical and is time consuming and even potentially a little dangerous.
Another thing to consider is being near your appliances and utilities. In a perfect world while working in the kitchen, juggling twenty things and trying to time everything so it all comes out perfectly timed and completely cooked – you'd be able to just lift your hand and the implement or small kitchen appliance you needed would appear. This isn't a perfect world however and instead we often end up rummaging and sorting through cupboards while our dinner slowly burns.