I've always loved bananas - I eat one almost everyday. I have a friend who recently ended up in the emergency room for a potassium deficiency and, while I know there are a lot more fruits and veggies out there that have potassium, sure enough she hates bananas.
I think bananas are great not just for their potassium level, but also because they provide energy and are very filling. If I eat a banana for an afternoon snack, I won't be tempted to eat anything else until dinner.