I had something of the opposite experience on my last trip to WDW. I'm the planner and went along with in-laws "laid-back" plan.
It drove me nuts that their version of "winging it" meant getting up late, waiting for everyone to get dressed, waiting for everyone to eat breakfast, waiting for everyone to get last minute items to take to the park, waiting for everyone to decide which park we were going to, waiting for everyone to decide which ride we would go on first. There were 13 of us total, including 3 young children, and 15 adults. Everyone else seemed to find nothing wrong with getting to the parks right before lunch and waiting in lines for everything, seeing and doing half of what people wanted to do because no one had planned anything. And then, the consensus was that the kids were misbehaving in the afternoons, when what they needed was a nap and a break. I did some rough calculations after the trip and figured that between the 13 of us, we has spent the equivalent of 2 people's vacations waiting!!!!
Personally, I prefer to be at the parks at or close to opening time and get in some rides while the kids (and DH and I) are fresh. My entire immediate family NEEDS an afternoon break away from the parks. A bit of planning lets us have the rest and relaxation that we need.
We will never go to WDW in such a large group again. And, if we ever travel with anyone to WDW in the future, we will arrange to meet for lunch, by the hotel pool for an afternoon break and/or for dinner and go off on our own most of the time in the parks.
EthansMom (and Molly's too)