Boats are fun and easy on your feet, if your tired from a long day in the park. We would usually walk to DS in the AM, it's faster to walk. Walking took us about 15min.
Boats seemed to come about 20-25min, and the ride takes about 15min. If we were unlucky, we would wait about 20min for a boat and then 15 to be dropped off at the YC. Sometimes we would have to wait for a second boat at DS closing time.