I think the hours are a good (bad?) sign of what to expect. Particularly because these are the "first guess" at hours. 9-10 each and every day that week at MK suggests there will be lots of heads in beds and feet on streets.
but, that's the week I'm going ('cause that's the week my kids have off). I'd recommend getting a copy of the Unofficial guide, and signing up for TourGuideMike; the latter will be particularly useful if the rumored EMH changes come through by then, as Mike updates his site regularly. He can give you the lowdown on the new "best days" for each park with the new EMHs.