What I love most (besides riding my bike), is the relative certainty of being on time. If I leave at 8:10 AM, I'll always (with the exception of a flat tire/or absolute catastrophe) arrive at work within a minute or two of 8:45 or 8:55 AM (depending on the route). My arrival time via Public Transportation or Car varies wildly; It could take up to 3 times as long as my shortest bike route, but, would seldom beat it.