Some of the replies in this thread are far from true (more to do with culture).
I moved over here about 7-8 years ago.
Coming from England it's pretty like for like in some respect. You seem like a smart person and you'll figure everything out. Of course you're going to miss certain things, mainly family and friends, you can't replace your childhood friends. Everything else you can get or arrange nowadays (maybe not 10-20yrs ago). The worlds is a much smaller place now days (logistics).
You'll love it and have a great time. If you don't.....at least you tried and you'll never regret that!
Any questions on anything please let me know. Healthcare is the only thing and you have that covered. You won't need a US license to drive, you can drive straight away just get your UK license and eventually might be able to get a US one (depending on visas etc). You can only work if you get a social security number and this can be a pain....or cash work. Or get a job you can do in England remotely (I had this when I first moved over here).
Yes you can get tea...Yes you can get decent bread...chocolate....crisps....etc hell I even can make roast potatoes!!
My toilet is exactly the same as the one in England

water and all!!
Also it's much easier and cheaper to watch football (EPL etc) over here!!
One thing I can describe....US has extremes in all aspects....filthy rich areas, and filthy poor areas. People in super shape, people super overweight. Restaurants galore (last 3-5yrs it's all about individually owned places and less about franchises, which has some fantastic places and variety). Extremes when it comes to terrain, weather, travel etc.
Best of luck - just 1000000% check your visa status.