CA has legendary traffic and I'd be a fool to debate that. However, I don't do long commutes here, because everything I need pretty damned close, within either a 20 minute drive or a bit of a walk. If you are a commuter it's hell, but if you actually position yourself someplace convenient (i.e. not a person who lives in Riverside and works in San Diego), it isn't that bad because you don't have to drive all over the place. Seriously what do you do that you wind up on these long sojourns to hate the place over them?
Hell, at least there are places to go here. Sure the roads are free in Nowhere, Montana, because there is nowhere to go on them. In other places that aren't devoid in life, you *will* have bad traffic as well. The only exception is that these places usually have some form of mass transit to balance it out. However I'd imagine if you lived in NYC you'd be complaining instead of either a.) insane taxis or b.) being a sardine in a subway car.
Most likely where it's worth to live, affordable, and has jobs nearby for the average joe, it will be crowded and you'll have to deal with people. It just so happens that CA with its ample opportunity, endless supply of crap to do, and best weather on the planet, lots of people want to be here.