There are many people who know that the earliest hours are the best for empty park touring but who still choose to arrive at 11:00am, because to them, vacation doesn't mean get up early.
There are people who wait 45 minutes to be seated at a restaurant, then another 90 minutes eating, losing hours of park time to have a meal that's as tasty as your typical chain restaurant yet twice as expensive...because to them vacation includes certain restaurants.
There are many people who spend up to $75 per person per day for a park ticket, yet spend hours by the hotel pool instead of in the parks. Somehow, those behaviors don't "amaze" anyone on here.
Not everyone wants to spend time planning or reading guide books. Some people - a lot of people - are just fine with showing up and letting the chips fall where they may. They may spend more time in lines, they may not eat at the restaurants you want would choose to eat at, but they still enjoy WDW.