AGREED
Just remember that many many people who visit Disney are not American and so visiting Starbucks in Disney is trying something different. The majority of the menu of Starbucks USA is different to Starbucks Ireland and Starbucks UK for example, so for me Starbucks in Disney is having drinks and food that I would not have at home
I guess its popularity outside of America is due to it being an American company which especially in Europe makes it attractive and popular. Any American pop culture is very popular in many countries