for me it is not a big deal and I can easily do that and I will just get even more Actifit steps on the days that I would have to do that.

That is the bright side of looking at it and a nice point of view to take. I like being able to walk to and from work only a few blocks away in Brooklyn. It really is such a blessing to live so close to my school!

the smell is not the most pleasant thing to deal with

Definitely a big issue in NYC as well, some stations/areas more than others. I'm sure in the winter plenty stay below ground in old forgotten tunnels etc. one fare can keep someone moving for days and days if they can eat in stations without leaving. NYC subway is a wild and amazing thing unlike any other system in the world.