Don't have any personal experience but I will dive in anyway.
First off here is a link to the official wedding site for Disney resorts.
Disney Weddings > Gateway
If you do not know it, Disney has a wedding Pavillion located between the Poly and the Grand Floridian.
According to my cursory glance at the website they offer a small wedding option there. You could then go over to the Grand Floridian for additional pictures. It seems like almost every time we stop by the GF in the afternoon, we see wedding parties being escorted around for pictures.
From what I have seen of the Wedding Gazebo at the Yacht Club, I think it would be a nice choice.
If you want to go the opposite way, the Polynesion Resort would be nice. I am not positive where Sunset Point is located, but I think the lush tropical theming would be nice.
BTW, congrats