*Note: What I and others have found is the longer you have been in Japan and the more of the language you speak and the more you overtly exhibit an understanding of Japanese culture thru your actions, (ie. - the more Japanese you "become") the more this factor DECREASES. At some point you actually reach a level where you "get too close".... and it can actually work against you and become a negative in some situations.
Heh. This is so very true. Anytime I start to get lumped in with everyone else, I just tell them I am going to have an American moment and that I don't feel like "echoing" (one of my Japanese colleague's poetic description of going with the flow). Now, we all get a good laugh when I get frustrated and say, "I am not echoing right now. I don't want to echo. I am an American, and we don't echo." For some reason, this blunt honesty always gets laughs, and not just the nervous, polite chuckle kind. In many ways, I think it makes them more comfortable that I don't try to become overly Japanese in the way that I do things. It makes me more exotic and entertaining to be around, I suppose. ::)

Fortunately, part of my job is to teach the community (everyone from teachers to students to town hall office workers) international communication. It gets to be a tough balance between doing things the Japanese way out of respect and courtesy and doing things in "my" way to show them, hey, sometimes you are going to have to learn how to communicate with people that are going to openly disagree with you. Mostly, I worry about not being too good at my job, but they keep begging me to recontract, so I must be getting something accidentally correct now and then. ;D
As for reverse culture shock, yes, that was definitely part of my vacation experience. For one thing, I had to get used to women walking around with their boobs out, so to speak. That was an easier aspect of culture shock to get used to.

Another pleasant reverse culture shock was getting used to big portions of food again. Not like I need it, but it does make me happy. :-[

The scariest thing to get used to again was going back to driving on the right hand side of the road. My partner was very calm about it when she kindly advised, "Perhaps you would like to drive on the other side of the road, sweety. You're back in America." :o

Anyway, culture shock and such aside, SFO can bite my chappy hide. Ugh. What a mangled airport it has become. And, I think we, as U.S. citizens, are shooting ourselves in the foot if we allow our airport security to be rude or hostile as a rule of thumb. That creates more problems than it solves. Of course, human nature being what it is . . . ::)
That's OK. I am just going to win some mega-lottery and buy my own aircraft and my own airport. When that happens, I'll let you know and you can all join me there. ;) Until then, if you have any problems with the Xyn Air staff, be it ticketing agents, baggage handlers, or flight crew, just let me know and I will get them back to straight and level. Oh, wait. I don't have any staff yet. Darn it.
A rambly all the best,
~Darrin