We are going 9/30-10/6 and are going to do EE then switch park if gets too crowded. There are lots of different opinions as to crowds that week due to 100th celebration. We are going to be flexible with our plans except for PS.
EE days are exhausting but the best way to get a lot accomplished in a short period of time. Fast pass is great too but can mean a lot of extra walking to do other things until it's time for your ride. It's nice to get to the parks early and feel like you have the place to yourselves.