As a veteran of many trips with my "vacation by the seat of our pants" parents (they once drove to the end of our driveway, then asked each other, "Okay, where are we going this time?"), I think those of us who plan and research are definitely in the minority. And people who won't plan or research a trip to WDW, probably won't bother to read the handouts they give you at the parks, either. They might glance at the map to find the nearest restroom or place to eat, but they're not going to read it word for word. They probably also start in the front of each park and do the attractions methodically before moving on (I speak from experience here), and trying to use fastpasses would just require too much thought and (in their opinion) loss of freedom. (They also probably wouldn't be able to find their way back to the attraction that they have the fastpasses for!) I wonder just how many "let's just wing it" types have read their handouts on their way home and said "Oh, sh**! We could have used fastpasses after all!"
Becky