The only intimate/escape location that they are starting to impose date restrictions is at Sunset Point, due to the heat and little shade. Check out disneyweddings.com and it will tell you more about times, restrictions, etc... We are getting married at the Gazebo in August (not a good time for an outdoor wedding, I know...tell the DF). One reason we went with it, is because I saw a ceiling fan inside there. That and we are having a 10am ceremony to try to avoid as much heat as possible !
I think there are some restrictions with the WP but only in regards to how far in advance intimiates can book. If you are looking at the Gazebo though, any time is fair game !