I'm a huge ice cream fan (had a milkshake night before last when it was 20 outside, honey thought I was crazy but a girl has to do what a girl has to do). I always have to stop at France, it's my favorite. I also like the ice cream parlor at Dolphin, in my opinion it beats Beaches and Cream and isn't as loud or crowded. If you just want a cone and not a mickey bar (which I personally do not like) in each park:
MK there is the Plaza Ice Cream Parlor, it may be Dryers but nothing beats an ice cream cone.
Epcot there is France and Gelato from Itlay.
HS there is Hollywood Scoops and I think Min and Bills serves it too.
AK there is Anandapur Ice Cream Truck, I think it's soft serve. I've never actually had a cone at AK, what is that? I'll have to take care of that in March.