I set out on a quest to find if this world has more planners or pants-ers. Alas, there is no definitive answer, at least on the internet. I did, however, determine that most writing instructors ask their students who is a planner and who is a pants-er. This informal poll-taking reports about 50/50.
So, whether you're a planner or a pants-er, you're in good company. How do we know? Here are some famous authors who plan and those who fly by the seat of their pants.