I've noticed definite benefits in my life when I've exercised my will power to achieve consistency.
I've seen it help me with my running. When I stick to my training program, instead of rearranging the order of my workouts I notice I feel stronger.
I've noticed it with my relationships. When I was really consistent calling my parents every Sunday when I lived out of state I felt a stronger bond with them.
I've noticed it with chores. When I get into a routine, I think less about how I don't want to do something and I just do it without really thinking.
I've noticed it best with waking up early. The more often I get up at the same time each morning, the less I think about it, and the easier it becomes.
Consistency is really, really hard. I find that I have spurts of it, a few months in a row here or there. But I'm always striving to maintain.