However, nothing is stopping you from going at a more leisure pace and taking breaks, ect. You just have to be smart about it. It's a theme park people... And probably the safest one at that.
Since we have joined DVC, we tour at a MUCH slower pace. We visit WDW 2-3 times a year, usually for at least a week at a time, and NEVER at the crazy busy times. We haven't used FP at all in the last few years, so I'm not sure how we feel about FP+, until it goes into full production. We know when to go to the parks to experience the attractions we want, but if FP+ causes greatly increased standby wait times, even early in the morning, we may have to rethink our strategy. For the record, on our last trip just last week, we were there for 6 days before even riding an attraction! There is just so much more to do, and we still haven't come close to doing it all! We had an AWESOME vacation, and it was very relaxing. It won't work for those once-in-a-lifetime guests, but it certainly works for us. If we don't get to an attraction on one trip, that's OK, because we know we will be back in a few months.