You don't realise how badly they are designed until you try to go there without your car. Maybe the train comes only twice in the morning, and twice in the afternoon. Maybe you have 1km of your ride that you must share with trucks on a busy road.
That depends the place. I had to use public transport in an European city every morning for some years, and my bus route had a bus every 5 minutes, making a lot of workers using it massively.
There are similar lines that move people from and to further industrial part of the city looking for the same result: Less cars in the road congesting the circulation, less pollution, less need to parking spot to the people, and less people who don't need a car.
Of course that depends, the place I'm working now has a train station just in front of the building, but I don't take it because there are only 2 train in the morning and 2 in the evening.
My previous employer had a train station in front of the building, and a train every 30min. I didn't take my car.
