The planning of your day made things less stressful and allowed for a more leisurely vacation WITH the 60 day booking window. I do not see how this is an arguement. It actually creates more spur of the moment decisions also. I could walk into the said park for the day, knowing I have dinner reservations at 7:30pm somewhere in the park or at a near by hotel. Then I'd have a total of 2 hours on the high end we know would be for rides specifically from the walk to the ride, the wait. The ride itself and exiting from the ride (and with FP it would be way less then 2 hours used). My family and I actually did not use FP like the common trend suggested. We never booked 3 rides in a row so that we can get more later. We would book them at 10 am, 1pm and 4pm. And all the time we saved on the ride waits along with the hours in between we would decide on a show, a meet and greet, grabbing a snack etc.
This model works as long as nothing changes and you keep it kinda basic. As with any schedule, the more items you put in it, the tighter it is packed, the more brittle and inflexible it becomes.
And reality is your plan isn't a single day, but really is your whole trip. You have plans for not just today, but every day, and they are all interdependent. Example: you picked FOP to be Tuesday for a reason... you can't afford to give up that plan because doing so means you'd never get another FP for the whole family at a time of your choosing. So now, Tuesday is locked, can't afford to change that.
What if it rains on the day you planned to be at the water park and instead want to goto MK... ooops, can't get any good FPs for MK because they were all committed weeks ago.
What if kid #2 isn't feeling well today and would rather stay back at the hotel for a couple hours? NO GOD DAMNIT WE MADE THIS PLAN MONTHS AGO AND WE DIVERGE WE LOSE OUR FPS!!
Making plans gives structure - that structure can work for you, but it can also work against you. The best planners are those that can adapt. The problem is when Disney commits nearly all it's resources to reservations months in advance, your ability to adapt is greatly crippled.
But for someone to say get rid of the 60 day booking window and the planning aspect when it has ZERO affect on a non planner to keep it and a lot of affect on planners, makes no sense to me.
This is patently false. Fastpasses were limited resource - when it is made available always has an effect on people who want to use it.