If that is your concern than you really are worried about nothing. I can tell you that a normal tourist will hardly notice any refugees here in Germany. If you go to my town hall to apply for a new passport (like a friend of mine did last year) then that might be a different story. And I am sure that most tourists won't go to the Greek/Macedonian border anyway.
All American cruise lines depend on European cruisers for their European itineraries. They market heavily everywhere. And Disney is no exception. I know that the
DCL Med cruises regularly have a Spanish speaking Assistant Cruise Director (might have some other title though), because there are so many people from Spain on the ship. Our cruise to Norway had plenty of Scandinavians.