Agreed, I moved 7-8 years ago when the opportunity came my way. Since then my earnings have increased substantially. Southern California has some of the best confluence of what most people (who are looking to leave), are wanting. You have the year-round weather, you have a bigger economy than the entire UK in one state and there are huge opportunities. You can go skiing in the mountains or surfing at the beach. Party your ass off in a club or go live a quiet life in a suburb or further out at a ranch.
It is certainly not for everyone. Is it better than living and working in the UK? In some regards, yes. In others, no. My wife and recently had a baby, we have good health insurance and so the cost was less than $1000. If we had not, the cost would have been $65,000. A 1400 Sq/ft house will cost something like $1mil if you are near an urban centre. There is substantial poverty and a huge wealth gap.
I go back to the UK for weeks at a time, several times through the year. Each time I do, I realise that I (personally) made the right decision. Typical British cultural things now grate on me, from The Daily Express/Mail and Phillip Schofield/Holly Willoughby to Coronation Street and Eastenders.
We are all products of our circumstances, one of the mental healthiest things I have done is not purchase cable TV. So I don't see the equivalent side of terrible US culture. Fox News, Jeopardy, Wheel of Fortune, Days of our lives etc.
One big thing I miss terribly while in the US, the rolling green English countryside. As someone who grew up in the Cotswolds, there is something intangibly unique about it that I have never experienced anywhere else.
Of course, my American wife wants to move to the UK