It does indeed have many positive aspects, but there is a definite downside, and you are wiser than I was to inquire about it in advance.

Bearing in mind that this is just my personal take, and someone else's would differ, here's what I would caution anyone contemplating such a move to consider:

The novelty wears off. All the art and architecture doesn't mean as much after the hundredth or thousandth time, and it becomes part of the background before long. The people who grew up here can be just as blasé about it as Americans are about wide streets, spacious houses, open spaces, and big cars, and will often pepper you with questions about all the seemingly wonderful American things they've seen on TV and envy us for.

You might find it hard to keep up with your friends for long. It's really a very long way away, and physical proximity is more important than you think. Social media, though, have recently helped in this regard. Maybe new expats or immigrants won't face the same problems with this that I had in the 90's.

You will not be the same person in a social sense. This can be good and bad. Your class, background, accent, taste, upbringing, schooling, family, etc., as they were in America, become irrelevant. Nobody cares here, or, 9 times out of 10, will even be able to tell, once you start shopping in local stores as your American clothes wear out. Instead, your identity will collapse to your nationality and only the broadest characteristics, such as age, occupation, and gender. If you have encountered discrimination on account of your background, such as having a regional or ethnic accent or having grown up in an unfashionable neighborhood, this may be a relief. If you are used to enjoying any status on account of these, you might feel put out by the sudden loss of such privilege.

Speaking of ethnicity, all of the European countries I have been to seem far more homogeneous, ethnically and culturally. Immigration is much less common or accepted, and where present on any scale, leads to poorly integrated and under-privileged enclaves. When I show class pictures to German friends and in-laws from my school days in southern California in the 1960's and 70's, in which my classmates were of all colors and origins, they seem truly nonplussed by just how diverse American society really is.

The language barrier is much more formidable than you anticipate. Your communication may remain frustratingly superficial for a long time, if not permanently. Even in larger cities with lots of people who have learned some English, the level is only rarely beyond intermediate at best, and you'll mostly just be making banal small talk. This gets old fast.

It's simply silly to say that most aspects of life are unqualifiedly better in these countries. Many are worse. Do you like the state making most decisions for you? Do you like crowds and traffic jams everywhere you go? Do you not mind working for modest pay and little chance of real material advancement? Do you not mind very long, dark, cold winters? Can you do without a car for most of your business? Will you tire of living in a small apartment, not unlikely for the rest of your days, and paying as much for it as you would for a house in most parts of America, apart from places like New York and San Francisco? Are you willing to send your kids to overcrowded, middling quality state universities, or do you want them to have a chance at the better offerings in America?

All this is not to say that it is a clear mistake to move here, but only to make you aware of the downside. On balance, I really do mostly enjoy being here, but it comes at a higher cost than I expected.