We were there this half term & a few people asked us why 'so many Brits are here!'. But - it wasn't too crowded & we had great weather, also schools had different weeks this year so it probably would be quieter the 1st week in November.
Also they start putting up the Holiday decorations

(we saw the Christmas tree at Epcot before we came back) - so you may get both Halloween & see some of the decorations.