Yes, there is, or at least, there should be, assuming that website will keep it's pooh together long enough to let you do it

Go to mydisneyphotopass.disny.go.com click on Walt Disney World, and sign in. You should now see your Photos and Videos. On the right, there should be three buttons that say "Link Photos," "Download Photos," "and "Share Photos."
Click on "Download Photos." This should open a popup window that says "Preparing Photos for Download." It will then say how many photos you have (1357 for me) and how much data that is (2374.75 MB for me). At the bottom of the window, click the green button that says "Download." and that will create your download set. Back on that main page, at the very top, next to the shopping cart, it says "My Downloads." Click on that, and you will then see a list of all of the download files. Click on each file to download it, and you will then have all of your photos.