We do the same thing. Our kids get paid their allowance in Disney Dollars. It is nice for them to have their
own spending money.
We save for our trips by purchasing Disney Dollars also. I save and buy them every other week. When I have
enough saved, I go purchase a park hopper ticket. It is a wonderful way to save. After I purchase all our tickets,
then I can start saving for food/spending money.
I was told you can pay for anything on Disney property with Disney Dollars. You can even pay for your resort room
with them. If you want to put credit on your KTTW card, you can pay extra Disney Dollars when you check in. It saves
from having to carry a lot of cash or DD around, and also saves from having to charge on your credit card!
Have a fun trip!!