All of Frontierland is closed during EE at MK. I guess because so many other rides are open in MK compared to the other parks' EEs. I imagine they don't want to have to pay too many people to work that extra hour. If you're looking for more exciting rides, I'd do Space Mountain, Buzz Lightyear and Indy Speedway during EE. That should take about an hour and then you can get Fastpasses to SP or BTMRR.