Well, I'm not one that has started any of these threads, but I can tell you that our last October trip, was our smoothest ever. My family loved being able to "show up" at a ride and get on with little to no wait.
But, we never really used the old FP system that much. Which I think makes a huge difference with regards to FP+, of whether you're going to like it or not. If we showed up to TT and the standby line was long, we'd look to see if there were FPs left, if not, we moved on. If there were, we'd grab one and come back.
This time, whenever our FP+ was scheduled for, we walked up, got in the FP return line and got on. They loved that aspect of it.
As far as easier to open doors, pay, enter the park with the band... Sure it's easier. I liked not having to dig out 4 cards, making sure I got them all back and safely put away. It was mildly easier than swiping a tiny card.
As far as the planning aspect, I love to plan. I'm kind of an over planner. So that didn't bother me.
So I don't think one thing more than another made it a smoother vacation than before. I think all of it combined made it smoother.
My DH hates Disney. I'll say it. He hates it. MK mostly. He tolerates the rest, for me and the kids. He actually uttered the words, "This time it wasn't so bad", on our last vacation. LOL
We leave in 2 days to head up there again, and I hope it goes just as smoothly.
But, not a fan of the tiered attractions. All of our FP+ for this trip in a few days were booked before tiers. So once we have to take a trip with that, I don't think I'll be as happy. And I'll admit in the beginning, I was a big proponent of this whole system. I still am. But not the tiered attractions.