You sure can! Well, I don't know for sure about EE but I know you can at 9am when Future World opens. They have the areas you can't go to blocked off and CM's stationed along the way to guide you into Future World.
Yes, you can. HOWEVER, don't plan of being one of the first to ride MS or TT. When you enter through the main gate, you can get through to the rope at SE by 8 AM.
At the IG, you don't even get your bags checked until 8AM so you are well behind those at the front gate.