I sometimes do a multimodal commute like this. When I do, it's about a 2-4 mile drive to the park and ride (depending on which one I choose) and then a 6-8 mile bike ride to work. I do this mainly in the winter so that I have the option of taking light rail most of the way back to the park and ride if it's raining. I don't like to ride in the rain after dark. Sometimes I do it just because I'm feeling lazy.
It would definitely be easier to just stay in the car, but I don't bike to work because it's easier. I do it because it's more enjoyable.