Understanding and displaying good management skills will help to position you for a successful career no matter what level you're starting at.
In new businesses, "management" is often considered "whatever needs to be done just to keep things afloat". However, for your business to grow and remain healthy, you must master certain basic skills in management and leadership -- skills that will help you avoid the crisis situations where you have to do "whatever it takes to stay afloat". The basic skills include problem solving and decision making, planning, meeting management, delegation, communications and managing yourself.
Those basics are also the foundation from which to develop more advanced practices in management and leadership. When organizational personnel struggle, it's often because they've forgotten the basics -- not because they aren't implementing state-of-the-art techniques in management and leadership.