Have you ever noticed that when you take a bus it will take at least 50% more time to get to your final destination vs. driving yourself. This would be fine but over time it really adds up. For example, if it would take you one hour to drive to work, if you take the bus it takes one and a half hours. In other words an extra hour of travel time a day.
1 hr/day * 5 days/week =5 hr/week of extra travel time.
5 hr/week * 52 weeks/year = 260 hr/year or 10.8 days/year of extra travel time.
I am personally sad to loose that time from my life.