We are spontaneous and far preferred FP+ to the previous system. Since we are not rope-drop visitors and often like to visit in the afternoon for just a few hours, with the old system, the fast passes were frequently gone by the time we arrived, or if available, had a return time for several hours later which we didn't want to wait around for. It was frustrating, for example, to arrive at Epcot and power walk to Soarin' only to get there and see that there were no fast passes left, or it would be 2 pm and the return time was 8 pm when we'd be long gone.
With FP+, we could schedule fast passes for the afternoon or evening, and we could schedule up to three within a short period so we could pop into the parks for several hours in the afternoon or evening and still enjoy a few rides. Maybe we didn't get the top headliners (I still haven't ridden FOP or SDMT, and TSM was open for years before we ever rode, lol) but we could schedule things like Soarin', Splash, Safari, Pirates, etc. and avoid long queues.
Since we are now local AP holders, we would not like to see future FP only being available for resort guests, nor would we like to see a daily cost that would make it unreasonably expensive for a short visit, like the daily rate for Universal's express pass. However, we love the Universal premier pass that allows use of the express line after 4 pm. We'd pay more for a Disney AP that included some limited use of FP like that.
I agree with other posters who say that Disney needs to come up with a system that is fair and efficient for all types of guests, whether staying at resorts or not, planners vs. spontaneous, rope droppers vs. late arrivers, day-long commandos vs. half-day visitors.