Consider those daily activities or behaviors we no longer need to think about to accomplish. Brushing our teeth, tying our shoes and even driving to work have become such routine tasks that we no longer need to engage our thoughts or emotions to perform them.
A habit is a recurrent, often unconscious behavioral pattern acquired through repetition. It is something we do or have done so often that we are able to perform it without having to think about it. We have all developed habits, some good such as brushing our teeth and some bad such as always arriving five minutes late.
Great explanation why worship is something we consciously choose to do, not something we do out of habit. Read the whole thing here. Good stuff.