They must have given you a break on the price because you used Disney for your wedding photography. I checked this a few weeks ago and it's still $350 for the rest of us.
Now that I think of it, you are right. Because I had so much photography, I was given either '09 or '10 prices, depending on what worked out better. I lucked out there
You definitely can't bring your own photographer, unfortunately. The same photo department that works on Disney weddings works on conventions and other special events, so you would book them just as a DFTW bride would.