Keep it in perspective against the old system. You would get 1 fast pass, and to get that fastpass you would sometimes have to run to a fastpass machine. Imagine A&E with paper fastpasses...You would have to be there at Rope Drop... period, and then sprint to the machine and hope. There was no planning beyond that 1 moment. If you didn't get the fastpass then all the effort was for nothing, and you had hopes and dreams that were shattered right there and then. There is nothing magical about entering the MK and someone in your party takes off with your tickets to the back of the park to get a FP for everyone. Maybe you get it, and maybe you don't. So planning wise, when is that A&E fastpass? Can't make any plans, don't know when that window will be. So your runner comes back triumphantly with the FP's, but they turn out to be at a time when you had an ADR, or you were planning to hop to another park, or worse, mid day, you miss the parade, or you don't get to go back to the resort for the mid day rest. Of course, now you can't get anymore FP's for a few hours, and you rearrange your plans on the fly to head not where you want to, but working your way towards the next FP ride you would want, so when you can get another FP you are near the machines that you needed.
FP+... you know which FPs you are going to get. Your "pre" planning might get ruined by not being able to get the ones you wanted, but you have 60 days to adjust your plans to fit. You get to walk into the MK as a group, and go. Enjoy the moment, the reveal from under the train station, the stroll down main street, and seeing the shops, and the windows. Nothing is more magical than that first walk down main street each time you visit WDW. Enjoy the moment, rather than having groups run to FP machines. You want planning, set up a FP for BTMRR, or Splash during Wishes. You pick your FP times and have a significantly greater chance of planning that moment on the new system vs the old system.
One other point... You should keep checking. Availability opens up all the time. Right up the the day you are in the park, heck, even in the park. I managed to get locked out of A&E and SDMT when my 60 days opened up last year. But I had both before I arrived. I even got a SDMT while playing with the app waiting in line for another ride.