Over the summer (July) we used EMH at night for the Magic Kingdom. The parks "closed" at 10, so we were at the MK until 1 am. Since it was sooooo hot, we would stay at the resort until late afternoon and arrive at MK between 4:30 pm and 6 pm. It was very nice because the heat of the day was gone. They reset the FP times at 10 pm so you can get FP during EMH. We definately liked this option and intend to use it again!
With this plan we could enjoy the resort and the parks!