Planning your days at Disney has its purpose- it helps you get along while you wait for your vacation. It helps you with the anticipation and gives you something to do until the trip. Most folks need to plan a WDW trip well in advance so there are months that go by from the time of the decision to go to WDW and the actual trip. These web sites and planning the "perfect" vacation helps us fill the gap.
Having said (written) that, when you finally arrive at WDW, take out your itinerary/plan that you've worked on and revised several times and throw it in the garbage can as soon as you get in your hotel room. It ceases to be helpful at that point. You have to go and move around the parks and such as feels right at the time. That's partially what makes it a vacation.
I've done this on all four of my trips and I can't imagine doing it any other way. The only thing that gets in the way are dining arrangements that you want- if you want a few specific sit-down meals you really need to have that planned in advance due to the availability and demand. I try to keep these "appointment" meals to a minimum during a week's stay. My wife must have had seven or eight PSs during our recent trip and I told her in advance that if I was having a good time around these meal times I was not going to interrupt myself to make it to a meal. I ended up meeting the rest of the family about four of those meals- two were breakfasts which are easier to make.
Having said (written) that, when you finally arrive at WDW, take out your itinerary/plan that you've worked on and revised several times and throw it in the garbage can as soon as you get in your hotel room. It ceases to be helpful at that point. You have to go and move around the parks and such as feels right at the time. That's partially what makes it a vacation.
I've done this on all four of my trips and I can't imagine doing it any other way. The only thing that gets in the way are dining arrangements that you want- if you want a few specific sit-down meals you really need to have that planned in advance due to the availability and demand. I try to keep these "appointment" meals to a minimum during a week's stay. My wife must have had seven or eight PSs during our recent trip and I told her in advance that if I was having a good time around these meal times I was not going to interrupt myself to make it to a meal. I ended up meeting the rest of the family about four of those meals- two were breakfasts which are easier to make.

) I found that if we don't get up at the crack of dawn and hit the parks when they open, the day seems too short. Plus we go in off times, and the park hours are shorter. Now, as for actual plans, no we don't make those. I usually make only one ADR (for BOMA) and the rest of the time we wing it. We loosely plan enough that we'll get to do everything we want to do.
so, we need to be flexable to avoid large crowds and caos. Both of us get along better when we do not have a group all trying do decide what to do, meanwhile nothing gets decided. 

