It's almost as though people are spoiled by machinery that reduces the amount of physical work that we have to do to accomplish a task. So the idea of riding a bike and thereby putting forth actual physical effort when an "easier" alternative is available doesn't appeal to them. They figure "why ride a bike and do all that pedalling when I could just sit in a car and drive?" If you think about it, nearly every new invention over the past 30-40 years has been for the sole purpose of making us more "efficient", thus reducing the amount of physical labor we have to put into accomplishing everyday tasks.