Coming from Europe, I travelled quite a lot to the US between 2006 to 2012 or so, when I was visiting conferences and the like. Loved every trip *once I got in*. I mean, in general friendly people, lots of wonderful sights you have seen in movies, great outdoors (still would like to visit Grand Canyon and Yellowstone), but until you get to that point it's a pain.
Even coming from a visa waiver country, the whole ordeal at border was just painful. I don't particularly have a problem with them taking fingerprints and whatnot as such, but always the 2-4 hour lines, in general hostile attitude from the agents and the overall paranoia just gives the first impression where the whole country says go away. Lessons learned after very first trip where after landing at JFK I was to change planes bound for San Diego: Always transit at European side of the pond so you are on your way to your final destination directly, because there's no telling how much time you'll be spending waiting to even get processed.
Anyway, that was traveling for "work". I was getting paid and reimbursed for my time. As a tourist, especially with family, I have just been back for the two solar eclipses in 2017 and 2024. It takes literally a celestial event to go through that ordeal which is getting into the US when you are paying for your own trip.
Frankly, on every trip, I have always been worried that some clerical error or just nastiness from an agent who needs to fill out some quota suddenly results in ENTRY REJECTED stamp and spending a day or two at the airport before getting departed.
But.. until now the general expectation has been that at worst case they'll just put you on the next flight back home. Now you might apparently be stuck on some detention center in the middle of nowhere for a month and just disappear if they have a bad day. And yeah, I'm a white guy so even the Family Guy meme with the color chart doesn't isn't part of it. I'm sure people with darker skins have even more to worry about.
I hope that by the time I'm retiring and have lots of free time, things are looking up again. A long-time dream has been to just visit every state in the lower 48 - just fly in to Boston or Miami, buy a car, drive through east coast and then start heading west in some funny zigzag pattern until departing from somewhere in the west coast several month later. There's just so much to see and experience, and having a common language and connected highway system to make transportation easy is a huge perk. Here's to hoping.