Some folks don't necessarily like to plan their day out knowing they must be at Space Mountain at 3:00, and Jungle Cruise at 4:55....the thing is that for visitors trying to do as many attractions as possible, it will eventually be necessary to wait in a standby line (i doubt you could use FP at all 9 MK FP attractions). So the time you save using FP is many times useless after you count in all your backtracking, waiting to get your FP, waiting in the FP line, and waiting in longer standby lines. (Muppets, ITTBAB, POTC, WtP, Star Tours, HM, IASWHoliday (DL) all had their experiences improved after FP was removed, and they continue to reduce FP scheduling and i even got to experience Space Mtn. without FP before it opened in July...it was wonderful! There are many attractions at WDW that should do the same because they simply do not need it (Philharmagic, HISTA, Star Tours, etc.etc.)
Sorry, but i preferred the days where you went into a line, constantly moved, and got to enjoy the build-up of the well themed queue before embarking on the attraction (now at many once great queues like Indy (DL), and RnRC, you are simply rushed through)...Of course, this is just my opinion, but i would like to see either a reduction of FP attractions, or changing ratios to allow a more 50/50 type standby-fastpass system (this being of course if we can't get rid of the system altogether)