Many are not.
But to your point: why are you all perfectly happy?
I remember a priest I know, who was dogmatically against the WRO, and how universal the Constantinople rite was (I'm not sure if he knew of any other Eastern rite)....The Church, he insisted is supposed to be different from the world: he was one for all the rubrics and not letting one litany drop, but had no use for pomp outside the Church door, even not going to his college graduation, for instance. Problem is, is that that is not a Church-World distinction but a East-West distinction, which anyone who sees Eastern cultures operating outside the Church can attest.
When I brought this up, some scurried to find photos of eleborate Western Churches, but I saw no plain Eastern ones.
So a comparison of Western and Eastern secular ceremonial shows a difference which is reflected in the Western and Eastern rites, and other matters: the West has tried to keep the Scripture in the standard from of the contemporary vernacular ever since the Vulgate (indeed the Itala). The East has been quite comfortable with diaglossia, at one time even contemplating Atticising the Koine of Scripture (as is done in the Church writings). I am just curious that defenders of the Eastern rite in the West sound like the defenders of the Latin mass. Uncomfortably close.
I don't see what the big deal is. He said he's perfectly happy, what's wrong with that? I myself came from the RCC and much prefer the Eastern Orthodox way over the RC offering. Liturgical variety doesn't interest me -- I'd be happy attending the DL of St. John for the rest of my life. Note that I'm not saying my way has to be the way for everyone, but I feel that a simple "Western country = Western rite" can only lead to problems.
When the OCA Cathedral here switched to English (or rather, started using English), one gentleman sighed that "Oh, Vladiko, when you hear the old Russian tone, you get a warm feeling here (hand over heart). Archb. John, of blessed memory responded: "Yes, I get the same feeling after three vodkas."
What is a problem, and why I said anything at all, is that usually those who are quite fine with the Constantinople rite are not fine with those who are not. And among the former I find a lot of confusion between nostalgia, revisionism, mystique, the exotic and equating it with piety.
The issue of Western country=Western rite is the odds are that in a Western country, most are Westerners. You can find Westerners in the East, just not that many (remember: EP Celarius closed Latin rite parishes in Constantinople, so they were there).