We'll be there Oct. 25- Nov. 7! I'm getting so excited. DH and I spent our honeymoon at WDW just over 14 years ago. You can probably tell from all the anniversaries mentioned here it's lucky to associate WDW with your marriage!!!
As for the proposal, you couldn't go wrong at the castle. Or, if she has a favorite ride or attraction you could do it there (obviously not during RnRC or the thrill rides). For instance Spaceship Earth, Buzz, Kilimanjaro Safari, would be memorable.