Our mind favours things that we are familiar with. This has to do with comfort.
Most people take the same route to work and same route back from work. They hardly change. Why? Because it is something that they are familiar with and that is something they do on a daily basis. By doing it repeatedly, they now hardly have to think about it when they do the routine action. It takes the “work” out of their conscious mind.
The conscious mind is too small and restricted in its capacity. That is why it finds way to get itself free from overloading. By placing things in a habitual mode, it relinquishes its responsibility over to the subconscious mind.