I agree with this too. We're doing both EMM at TSL and at MK, and honestly one of the biggest benefits to me is not having to worry about getting fastpasses for those attractions, and being able to devote my three for those days to other rides. We're only at WDW for 6 full days, so we don't have the luxury of going to every park multiple times. Also, my partner doesn't like crowds or heat particularly (I realise both crowds and heat are unavoidable at WDW obviously!) so if we can get these high-value attractions done when it's cooler first thing in the morning, and when the crowds are less than normal, then that's a massive win for me.