We did shorter days in the parks not because we wanted to, but because we felt like we had no other choice. If you don't want to wait in lines, what's the point in hanging around the parks, being constantly reminded of all the stuff you used to be able to do without a wait under the old system?
Example: on our last trip with legacy FP, we spent thirteen hours (without a break) at DHS. We did TSM 4 times that day, Star Tours 6 times, BatB, Fantasmic, the Muppets, JTA, the Disney Junior show, One Man's Dream, Characterpalooza, a bunch of other character M&Gs, and two TS meals. TOT and RNR were skipped by choice. No meltdowns from anyone...that probably goes down as one of our greatest, most fun Disney days. It was one of those days where the weather was beautiful and everything came together just right.