YMMV but the reason I bike to work (and have been biking to work for the past 7 years) is because I enjoy the experience of going as hard as I can, heart pumping, asphalt rolling fast under my wheel while taking turns fast, feeling wind in my hair. You won't see me smiling (while passing you at 25mph) just like you won't see someone at the gym smiling when pushing heavy weights, but I prefer my commute to the alternative of driving stuck in traffic. Because for me the alternative isn't "bike relaxed, take in the nature", that's just too boring and slow and it doesn't hold any interest to me.

So you people need to stop being judgy. I won't judge someone because they ride a crappy looking bike in crappy clothes so don't judge someone for riding a fancy looking bike in lycra (which btw is very comfortable athletic wear, you should try it). Everyone is having fun in their own way, they have their own motivations for doing some of the same things. Just because I put a lot of effort (and money) into my biking it doesn't mean I don't enjoy it, it's my favorite part of going to work.