if you have never attended an EMH, then (respectfully) you really don't know the benefit
Point taken. And, we are thinking about doing one or two during this February's OKW stay. We'll see.
However, in past trips, we have done everything we wanted to do multiple times, with short waits and moderate crowds, even on President's Week, by
avoiding EMH parks entirely. I prefer my
Extra Magic Hours of Sleep instead.
I'll also note that I cannot think of a
single "professional" planning resource that recommends EMHs as a matter of course. TourGuideMike, the Unofficial Guide/Touringplans crowd calendars, and RideMax
all recommend avoiding them most of the time, because the wait times overall on EMH days are longer for the bulk of the day.
In at least one case (AK pre-Everest) the Unofficial Guide guys found that you got
less done following their touring plans on an EMH morning than you did on a non-EMH day, even though the non-EMH day was shorter.
There are times (like Pat's case) where EMH is a godsend. As another example, folks coming form the West Coast might really get a lot out of evening EMH while their body clocks adjust. If you want to, hopping away from a morning (or to an evening) can also work well.
But, the "pros" all agree: for the average guest on an average trip, it's a good idea to avoid EMHs as a general rule.
That said, if you really want the best of both worlds, you can often book an offsite villa
and a limited hook-up campsite at Ft. Wilderness for less than two Value rooms. That gives you tons of space, excellent amenities, and all the EMH you can stand for a very reasonable price.