Throw in another vote for the Dessert Party. Then if you can swing it, add "guests".
At our wedding, we were at the WP. Someone actually yelped at the confetti cannons (which made for a great picture).
We also had Mickey and Minnie at our wedding, and for people who had never been to Disney (95% of our guests) and the few who have been before (3 couples, including us), it was so great. Even my mom danced with Minnie (and I have PROOF).
But the piece de resistance was the Dessert Party. Again, only 3 couples (including us) have ever been to Disney, and EVERYONE, including the 3 couples said that was the best part of the night. You get your own private viewing section, and you feel like you are king and queen of your realm - no one else can get to your area except you and your party. Made us feel like we had the whole fireworks to ourselves!
Hope this helps - best wishes!