Hmm, cool post! It is one of those things I think about if I am the only one doing it or not.
In Portland (OR), on the Max train on some of them they are jointed and have a rotating disk in the middle you can stand on. It is challenhingto stand on this disk section during a turn becuse you have the trains' movement, plus the movement of this disk.
I think it can help, just like balancing on one leg for 30 sec the first day, 1 min the next day, 2 min the next day, etc. can help. ESPECIALLY, since we try to make martial arts a healthy habit and part of daily life, and most people take the bus/train very often.