What's with RFD's obsession with prime lenses?
Yes, most pros only use primes, but again they usually shoot in a studio or in a very controlled environment. No one carries around 3-6 flash umbrellas and reflectors to take occasional or impromptu photos.
It's like recommending someone buy a pentium 4 running windows XP because it's been around so long that 80% (?) of corporations still run it. I know my company does... that almost 30k users!
Disclaimer: I don't have a 50 1.8. I have a 50 1.4, which collects dust. The kit 18-55 and 28-135 have far more versatility.