Whenever riding the subway you will realise quickly if you are surrounded by experienced users or not. Experienced everyday users can be mainly met during rush hour, will move into the aisles quickly and voluntarly, they will keep the doors free to close and will move out of the way to let someone pass who wants to get off. They learned through years of experience that it goes faster and smoother this way. As opposed to newbies or less frequent user one will meet in the subway on a sunday afternoon. They are not as practiced and in the eyes of an old seasoned traveller will do everything wrong and therefore make his experience less enjoyable.
Just a little thing to keep in mind when designing products. You always (at least almost) have those two groups. Try to accomodate both. Easy access and start for those who only come by once a year. Expert features and shortcuts for those who know their way around and know what they are doing.
Unfortunately there is no experts only area on the subway.