I never eat burgers in the UK but love their burgers with the toppings bar, mmmm! yummy, extra fried onions, mushrooms, loads of salad.....
I am completely the same...
Definitely try the different flavour sodas: "root beer" can be very nice, grape soda, maybe cream soda... different things that you don't get over here. Maybe an ice cream float? Their milkshakes and malts are rather wicke (heart attack in a glass...).
"Gummy Lifesavers" (soft chewy jelly sweets) - the berry flavoured bags are even better.
Cinnabons definitely - we tend to split one because the icing they smear across the top is SOOOOOOO sweet.
Churos (like a long, thin crispy donut)
Ribs - BBQ smoothered ribs.... rarely get good ones in this country.
As someone said, "bloomin onion" (like a BIG opened up deep fried onion with a slightly spicy dip). Available at the "Outback Steakhouse" (which also does good ribs...)
If it is within budget, go for a GOOD steak at a "proper steakhouse" (like Shula's -
http://www.donshula.com/ - they have one at the Dolphin hotel) - it will blow away any steak you have ever had in the UK...
"Dippin Dots" (
http://www.dippindots.com/) - there are sometimes small stalls selling them at some of the theme parks (probably more Universal than Disney though).
Oh and DEFINITELY go to e Tepanyaki restaurant. There is one in EPCOT Japan or you could go to the Kobe Steakhouse (
http://www.kobesteakhouse.com/). It is more than just a restaurant, it is a dining experience
Have fun
Boo