To be 100% honest, if it wasn't for the pay, I would move back in a heartbeat. I lived many years in Germany and UK, and quality of life is amazing, loved it. But I need to think about my family, we invested too much in the past and now it has to be worth it.
Knowing and reading often how good the european market is right now (I mean how easy would it be to move back), is kinda painful.
Anf the US is super expensive....yes and no. Depending on where you live, and what you do with your money. You can also have an amazing quality of life here, without living in Manhattan or San Francisco. Now, god forbid you have 4 kids and they all wanna go to college haha, and of course health issues....but GOOD jobs here offer great insurances. Like with everything else, pros and cons and it always depends on who you ask.
OP, if you don't have a family to take care of, go for it man.