We for sure must use different parts of our brain. The part of our brain that is in charge of paying the bills is not the part of our brain that is enjoying riding dumbo or paying an extra $20 dollars to get on the mine train.How you enjoy it is part of the value. If you still enjoy it, no matter the cost, than that is what it is worth to you or anyone else that feels the same way. If anyone felt it was no longer worth the money they would not be getting what they are paying for and therefore would no longer find sufficient joy in the expense. The enjoyment part can only be measured by yourself, there is no sliding scale to look at. The real measure that you have is since you mentioned "other vacation destinations", if you HAD to chose Disney or "the other" which one would you pick. That is what determines the worth for you specifically.
I agree “value” could be an abstract concept and is different for everyone. If one has enough disposable income, it means something very different, “here’s my money, I just want X, I don’t care the cost.