Uh, firstly, have you heard of this invention called public transit. Or this other invention called a bike? Also, this comparison to crowds around stadiums is bizarre. Cars use up more space than pedestrians, so it is possible to commue by car, then it is possible to commute on foot - at least as far as crowding is concerned.
Did I say car? I said "by faster mechanical means". That would be bikes/busses/trains/helicopters/escalators and everything else mechanical as in mechanisms as in everything not-pedestrian, a big field.
Neither pedestrian crowding nor travel distance is an issue in walkable cities, because public transit and cycling is compatible with a walkable city. There is nothing difficult about it, there exist thousands of walkable cities.
Another concept you may learn about is „mixed used neighborhoods“. It turns out you dont have to separate out working and residential areas, this will reduce travel distances. A related concept is the „polycentric city“.
