In comparing train systems in Chicago and Denver, I noted that, in Chicago, the train stops more often, and in places where the people need it.  I think the subway in NY is similar.  Here, RTD seems to dictate where the people need to go to catch the train.  In  other words, in most cases, you can't walk to a stop.  You still have to use your car (or a bus) to get to a stop, and then park.