Found (and kept) this from a thread a few years back. Always wanted to try, but haven't yet. May have to re-check the times.
An evening on Seven Seas Lagoon: eat at the Artist Point at the Wilderness Lodge. If you time it right (get there for about 7:30 PM to 8:00 PM), you can have a nice meal and finish dessert just after 9 PM, at which time you can stroll down to the dock or the beach to watch the Electric Water Pageant as it passes the Lodge. Then board the next boat toward the MK, (no earlier than 9:45 PM) and you will be halfway across the lake when the 10 PM fireworks start over Cinderella Castle. This is a beautiful way to view the fireworks, and is really romantic as the boat captain will dim the onboard lights during the show, and may even pause before docking to allow you to see the show to the end. Sit in the front of the boat for the best view, it's really beautiful.