I have to disagree. It is not a small portion. There are walls up now at both entrances. With the one at Future World being pretty bad. Spaceship Earth, once it closes, is estimated to be down more than a year. The fountain is being removed. Both the Starbucks and Mousegears are going to be moved to temporary homes. The Electric Umbrella is going to close. Club Cool will be no more. That is more than a few construction walls.
I posted a few days ago while at Epcot that if you are driving to the park you should expect longer than normal walks, as you have to go way around to the left to where they have security set up. And then the lines were enormous. The lines to get into the park were bad too, but thank goodness for my AP. That line was empty.
I love Epcot. And the thought of what they are doing all at once makes me cringe.