When my children were small I would have rather had a root canal than do WDW in mid-summer...but they are teens now. We are going in early August and they are taking lots of friends...we did it last year and had a ball...We (the clever adults in the crowd), get up early, hit the early opening park (really missed that last year)...do a few things, and when we see steam come off the asphalt we recognize that as a sign from God that it is time to leave!! We have a leisurely lunch somewhere cool and relaxing and wander back to OKW, for a shower and siesta and some afternoon reading. We usually hook up with the kids sometime after dinner for a few hours in the parks.
The teens on the other hand, sleep in, giggle a lot and slowly but surely haul themselves to the pool about 11AM or so. They make heavy use of sunscreen for a couple hours, return to shower and change (this takes a while since looking good is important even when you sweat apparently), They then depart for a park by mid afternoon and stay until closing. Sometimes they ambitiously get up before noon and hit Disney Quest or a water park.
It is nothing like the frantic pace we did years ago (and still tend to do when we go in early December)....but I've got to say, it is SO MUCH FUN!!
MK on a warm summer evening, sitting on the beach at the Poly to watch fireworks after a nice dinner at O'Hana's, e-ticket nites until 2AM, Dinner outside at the Rose and Crown, with the breeze coming off the lake waiting for Illunimations to start....ahhhh (doesn't it make you want to get on a WDW bus right now???)
Summer is no time for theme park commandos, but for those who know how to vacation well ..it is still a pretty great time at WDW
Go and have fun.