The bank machine at Wilderness Lodge charges $2.50 service charge on top of whatever you are getting out of the machine. When the charge hits my bank here in Canada, the amount is converted (of course) and then they charge me an additional $3.00 service charge for using a foreign bank machine.
I think every bank has different charges so you may want to check before you leave. The $2.50 charge comes from the bank in Florida who is operating the machine.
I always try and take enough money but if I need some then I make sure to take out enough to make it worth the bank charges.
Of course, on Disney property you can charge almost everything to your room and have it put on your credit card. I usually try and remember to keep enough cash for the gas purchases on the ride home because I love those cash only gas prices.
Have a great day!!