Planning you day, your week, your month.... your life ahead, to me is the single most powerful decision you can take in life.
This has been one of biggest skills from times i can remember. Be it in professional life, or in personal spaces... having a clear plan has helped me reach goals I couldn't have otherwise. It has helped me maintain relationships that matter, multi task, be social and yet retain my silent moment every single day.
'Begin with the End in Mind' from the 7 Habits of Highly Effective People , clearly outlines the importance of the difference between a clock and a compass driven path. To have a vision is not act on it daily, may be a daydream. But to keep acting on something without a clear vision, can be a nightmare.
Yes, our plans will never go exactly the way we put them together, but having clarity of where you are headed, what you really want to achieve out of every precious moment of time, ounce of energy and effort you are putting into something, is powerful. It will help you with better proactive forward thinking, risk assessment, decision making etc and enable you to change course as needed. That level of control on our lives leads to a more peaceful mind, a healthy body and most importantly, a balanced life.