Planning is a very important aspect of life, whether you are a student, an employee, an executive, a manager, an investor, an entrepreneur, or even a homemaker.  It is a method to show how to focus on the goal you have set for yourself. Planning can help you to achieve that goal even while making provisions for unforeseen occurrences in the process.

One can break the long term plans to daily and weekly plans to assess if our tasks are on schedule.  But planning is done only after analyzing priorities.

There is always an option of going with the flow.  But life is very long and may cause severe distress if it is not lived according to some plans. The only time when prioritization can be given the least importance is when you are on vacation. 

Successful people arrest initiative and try to achieve goals within a period through an organization.  The organization is possible only on prioritization.