I assume you are referring to the Refreshment Corner hosted by Coca-Cola. Yes, there are sponsers all over the park, but thats all they are generally. In the Refreshment Counter most products are NOT Coca-Cola products. I'm not aware of any commercial enterprise entirely built around a common brand that you'd find outside the parks. There are restaurants in Disney owned and operated by popular corporations but their menus, theming etc. are completely different than you'd find elsewhere. If this Starbucks does not use their name, logo, theming or menu and simply supplies the base ingredients and operates it then it could work.
I guess for me, corporate presence comes down to one thing - is the name and logo there or not. If it is, they have a presence - it doesn't really matter if they are there with their own products or not, they have gotten their logo into the park and thus into my mind therefore achieving their ends, which is to make me more aware of their brand. When I see a Coca-Cola commercial on TV a hand doesn't reach through the TV and hand me a Coke but I am more aware of the brand in that moment and the "seed" so to speak, has been planted in my mind.
That said, it's hard to compare Starbucks and Coca-Cola in this instance (apples and oranges, kind of) - Coca-Cola sells pre-bottled drinks. The Refreshment Corner DOES sell several Coke-brand beverages, and the rest of the park also serves only Coca-Cola brand drinks - no Pepsi to be had. Unless they wanted to have vending machines or a shop where they ONLY sold drinks, they couldn't really have a standalone store in the parks even if they wanted to - with their products it wouldn't make sense. But Starbucks does have products that make having a full store make sense, so for them, they could have a Starbucks themed store in the parks and it could sell their usual menu (which according to most people in this thread would be welcomed!). They have that option that Coke doesn't really have.
I think the thing here is that we start to just not notice Coke - it's everywhere, in real life and in the parks. So is Starbucks (for the former at this point) but it's newer, still more "controversial" in some ways for lack of a better term, and less intergrated with our consciousness. We half expect to see Coca-Cola EVERYWHERE we go, and we will in DL too, whenever we buy a bottle of water or pop, but it hardly registers anymore. That brand presence is already there just as strongly as Starbucks will be in a couple months.
*whew* Anyways, didn't mean to go on and on like that! LOL! But I guess overall my point is that there is advertising and brand presence already in the parks, well established for many years, so having one more brand there (and according to the Disney blog, Starbucks locations in the park will be themed to fit in with its surroundings) won't really hurt the feel of the park or harm the magic! It's too strong for that!
