I also happen to bike to work and it's indeed a refreshing experience. For me, the hard part is on the morning where the ride is 10km of climbing only — it starts in somewhat traffic heavy streets and ends in a peaceful quiet forest. The good thing is that the evening ride requires almost no effort, and it's a real pleasure to feel the wind on the hot days.

I wouldn't do it if I couldn't take a shower at work, though.

(Also, piece of advice : take your breakfast AFTER the ride. Your guts will thank you for not doing it before and you will enjoy the taste of food even more)