Why Disney Took Over The Dole Whip

Disneyland is famous for its ridiculously long lines. And one or two other things. But some of the longest lines are for something called Dole Whip, a delicious frozen treat that - for a while - you could only get by taking a trip to the happiest place on Earth. So how did a simple drink sponsored by a fruit company become a destination icon? Have YOU ever had a Dole Whip? Ever bought Dole Whip at the grocery store?