The instructor is the leader and what you do is closely watched by students who want to follow in your footsteps. Being in control and organized sets a great example for the students. Having your course outline, study guide, informational materials, field trips, quizzes, etc reflects to the students that you care about them. A unorganized instructor projects a confused person. A classroom unorganized seems unfocused and all over the place. Therefore to be well organized in a well organized class speaks commitment, good teaching and a place for good learning.