I've lived out of California now for almost 7 consecutive years (though did live away some as well between 2000 and 2009.
There seem to be only 3 things I really miss and they are:
1) Food! In California we are spoiled as I grew up eating so many different types of foods, especially Mexican, Korean, Chinese, Vietnamese, Japanese, among many others, that in some ways I don't even consider them foreign food. I also miss good fast food like In N Out and Popeye's. Nando's, Wagamama and Yo! Sushi, while pretty good in their own right, just don't cut it.
2) Landscapes. Mountains, deserts, forest, farmland, ocean, green hills/yellow hills, volcanoes, volcanic strewn plains, snow, sand, etc is something I deeply miss. Driving across them just fills me with so much pleasure and excitement.
3) Seeing a doctor. I'm not referring to price or anything to do with insurance, so please, not comments about that but just the simple act of seeing one. No 10 minute limit, no GP sitting behind a desk like some bureaucrat. I miss walking into the doctor's office and the doctor is dressed in her/his scrubs, and we sit in a normal examination room rather than some "normal" office and she/he seems to actually be devoted to figuring out what's wrong with me.
Beyond these 3 things, I prefer it in the UK/Europe:
1) better quality roads
2) trains
3) history everywhere
4) walkable cities
5) Downtowns/city centres that do become ghosts towns after 5 pm but are a source of activity all the time
6) Freeview
7) decent amount of holiday pay codified in law
8 ) government mandated sick leave/pay (so it's not so great in the UK compared to another country in Europe I lived but it's something)
9) pub culture
10) the fact that the police are so polite and try to use their brains rather than just act like tough guys" all the time
11) much better quality driving (like the little polite waves here in the UK or Western Europeans in general not undertaking (this is frustrating as hell in US cities) roundabouts and yield signs rather than stop signs
12) BBC radio 4 (NPR isn't even close)
13) the fact that VAT is included in the price instead of of added after the fact like sales 14) tax election cycles that don't go on for half the time (no exaggeration)
15) more civilized debate with controversial topics such as abortion (though I have noticed a slight switch towards the more emotional/yelling US model)
16) the ability to buy and sell and tax a car all through the post/mail rather than having to go the DMV website or shaving to go there just to stand in line for hours, only to get a rude person at the end of it
17) electric kettles (most Americans I think still are clueless about them)
18) exciting debate in the House of Commons (the House of Reps or the Senate is a snooze fest).
I'm sure there are other things which I will add if/as I think of them.
What are your thoughts?