They are big, but the layout is such that the walkways are in the center and the attractions are on the perimeter. You are walking in a big circle, not different pathways like you find in WDW. You actually walk less because of this and you don't miss anything since everything is off the main walk, follow it all the way around and you will wind up where you started!
You will find that you walk less and cover more territory in a shorter time.