Let me ask you a question: When did you last do something for the very first time, or did a familiar thing in a different way?
We humans, apart from being way too complicated for our own good, are creatures of habit. Believe it or not, that doesn’t mean we’re lazy or unadventurous. That just happens to be how our brains work best. Whenever we perform an action (or think a particular thought) pathways are laid out in our brains specific to that action. If we do that same action again, another pathway is laid down in the same place. The more times we do the action, the bigger that pathway gets until it becomes established in our brains as our preferred way of performing that action.