We too are just back from 8 days at WDW.
The only place that we found the crowds overwhelming was at Blizzard Beach. BY 10-10:30 in the morning the lines for the big slides were longer than any of the lines we had waited in at MK.
Be sure to use fastpasss and EE !!
We were planning to do an e-night while we were there, but we had ridden all of the "big" rides so many times during our 2 days in the MK that we didn't feel the need to stay late.
Have a great time !!