I really like magic bands and all you can do with them. But I do understand the OP's frustration with FP+. It worked out ok for our family last summer but overall I'm just not a big fan of choosing individual rides months in advance. It would be nice if some time in the future they increase the daily number of fp's you receive and let you have fp's for more than 1 park per day. I had no trouble switching fp's except for maybe the big headliner attractions like 7DMT.
This system is really the same as the old system in most ways. The difference is that in the old system, there were those that could study and use their knowledge to their advantage using resources like this board. I did it... many of us did it. Now, there is way more awareness and tutorial offered, and more people are using it. There are more rides covered by it, so naturally, if you have a fp line, you get a longer standby.
In the end, it's really the same system, but now they give you earlier access to a larger choice of rides - and ram the instructions down your throat. The beauty is that you can edit the times after making the reservation, or change them altogether based on availability. FP- never offered that.
You always had to wait to get your FP- until your window opened, or 2 hrs passed anyway. In essence, it's really the same thing. I know I could ride every open attraction in MK on a given day with 3 FPs + extras after used (even if I hop). I have changed my plans several times since 60 days out, and gotten everything I needed at close to perfect times, and I won't have to speed walk to snatch FPs to do it now! I have changed ADRs, and gotten perfect time slots. Of course, we don't do character dining - so maybe that makes our life easier, but I still have my BOG breakfast ressie for the 17th, which will make it superb for riding 7DMT with a very small (if any) wait without a FP or running! (6 days away from the good ol' MK!) w00t!
We "in the know" that still plan carefully, should be able to get every fastpass we must have in order to experience any park in a day - often with multiple repeat rides, when combining other strategies that are time tested. Although this will be my first FP+ trip, I guess my overall opinion is that I feel confident I will be will be able to execute our plans (which include a day where we plan to try to ride every headliner at WDW + much more - including an Ohana dinner, a dip at the resort, a shower, and a craft brew in between - our version of a 4 park challenge). I'll let you all know how it turns out next Sunday... I'm pretty sure I can do it, but I don't think I could have with FP-.