Years ago after watching our son devour a Mickey Bar for desert, we have one family member (46) who now gets one for himself after every dinner! Most wait staff will simply bring it at the end of the meal when the others are having coffee. Although watching most Americans grow more and more obese every decade might give him pause, he swam over 1,000 miles last year so could certainly use the extra calories.
Just as an FYI, if you ask, room service will also bring you one to your cabin 24/7.
One word of warning--do be cautious with developing a Mickey Bar addictiononce you go back to the parks, they are not included with the price of admission.