I've shipped to our resort utilizing the address from the Disney site. I placed our name and reservation number with check in date on label as well. IF I had anything that I thought had to be refrigerated, I noted that as well.
There was no fee when I did it, but Disney may be charging a nominal fee for delivery packages now.
I would suggest confirming all with reservations. And I'm sure you ll get other input here on the DIS.
Have a Magical Visit!