I did for 4 years, got everywhere too, and worked for a living.
Yeah, but you probably didn't have to grocery shop for a family of six, or take kids to Cub Scouts, church, etc. A contractor can't haul his supplies on the bus, either.
A person can manage without a personal vehicle in LA, but I don't recommend it. In those few times when I was without a vehicle in Los Angeles, I got physically ill over it. It was that big of a threat to my survival.