Early Morning at World Showcase
One of the highlights of our last trip was the International Gateway when it 1st opened in the morning. It was my job to run, and I mean run, to Soarin' to get fast passes. It was great to see UK and Canada with no one else there. For a minute, I had World Showcase to my self.
Also, the CM's opened the IG at the same time as the front gate; they were communicating by walkie talkie to assure simultaneouity. I assume Extra Magic Hours are observed as well.
By the way, the Boardwalk is great at night. There are jugglers and other street entertainers, the restuarants stay open fairly late, and the atmosphere is wonderful. Even if you're not staying at an EPCOT resort, you should try it after Ilumminations. Then, splurge and take a Taxi back to your hotel.
The Boardwalk during the day is also unique. Try one of those bicycle/cart things that hold up to four people. A workout, but fun.