Being residents of the Mid-Atlantic, my wife and I aren't exactly uncommon in being an interracial couple. Even when we were dating back in the late '80s and early '90s it wasn't terribly uncommon, though less so than now. I'm sure other areas of the country don't see so much, but here it's no big deal.
Still, it's not so common that Karen and I don't notice it when we're out places. Sometimes we'll see numerous other couples, which inevitably leads to our in joke that we didn't get the invitation.
Disney certainly provided opportunity for that. Of course, people are coming to Disney from around the world and the US. Statistically, there are bound to be a lot of mixes of couples, ethnically, religiously, and culturally.
As the years have gone by, there have been more such couples. Not just in my notice but statistically, too. We're taking over the world!
Good thing, too. Genetic diversity is necessary for a species to survive. Insular breeding leads to defects becoming prominet, like a Hapsburg or a Golden Retriever. Man or dog, keeping the spread of your genes in close proximity to your family tree is going to warp the branches of your tree. Mutts are best.