I'm at WDW right now and the last few days when we've made rope drop or close to it, we've managed to do about 8-10 rides and be out of the park by noonish. For example today at DHS we did R&RC twice, TSM twice, Star Tours twice, Indianna Jones, Little Mermaid, Pirates walk through, then had lunch and were walking out the park by noon. The other day at MK we did BTM twice, space Mountain x3, Haunted Mansion, Pirates, Buzz x2 had lunch and then left shortly after noon. At no time did we enter a standby line that had more than a 10-15 minute wait and we were constantly using FP and getting the next one as soon as we could. We had excellent mornings and thought we got a lot done without ever having to wait in a long line.
Now if the new FP+ let's me do that and then book more FP for in the evening then great, but if I can't get at least 8-10 rides of my choice and not stand in line for more than 15 max at a time, I'm not going to be happy. If I decide the value that Disney provides is no longer there, than I'm more than happy to go to Universal and use their Express Pass.
Of course none of this matters in the least if the IT department can't get their act together and get this working. From what I've seen, Disney must have the worst IT department of any major corporation.