Hey - I totally hear ya. I know binge eating way too well. I lost 90 pounds in my lifetime. Sweets are still my downfall. I believe in calories in vs. calories out while hitting your protein, etc. - but I have to restrict myself from sweets. One scoop of ice cream turns into chocolate and cookies and cake. Next thing I know I've taken in 3,000 calories. I hate talking about it because 1) it makes me feel weak and 2) people look at me and always say "well you can put on a few pounds now."
No, I can't. So going to Disney obviously makes me very nervous. I always lose about 5 pounds before going to Disney (as I previously mentioned.) All in all - even if you eat terribly the entire time at Disney, you need to take in 3,600 calories ABOVE the calories you burn. I invested in a Fitbit Charge HR and frankly, I spent a week measuring everything I ate and tracking calories burned. I wasn't a believer but it's pretty spot on.
Now - I know Disney's cals are pretty outrageous but I tend to burn 3,200-3,600 calories in Disney (results not typical). That would mean I'd need to take in about 7k calories to really do damage. I doubt I'm taking in THAT many calories (but who knows.)
Anyway - I see Disney as my time away from my diet and yes, I do binge. Not advocating it. It's definitely not the best thing to do and I hate myself for it. It's very hard to break out of it. What I'll typically do is enjoy myself the first day or two, then I'll spend my Counter Service with salads or chicken sandwiches, etc.