Hi Lucky,
Thanks for this post. It resets the conversation nicely (along w Ariel's)...
You know, it's certainly presented that way. Such that you can have a good time, sure. Maybe you don't like rides! Someone who doesn't like rides could certainly have a great time using FP+. Or... maybe you like to shop!

Or... maybe you like to stand in lines w your nose buried in your phone for hours, and maybe you like being on hold with Disney tech support. There are lots of reasons one might have a good time -- right? But it's never because...
You'll have a good time going on lots of stuff because of FP+. All the good times are presented "in spite of" FP+.
You make an example, right here:
Fp+ wont work for them to do a multitude of rides because I know S and she has as little patience as I do. See? Because she's impatient, she won't like FP+. a.k.a., unless you're okay with long waits, FP+ will be inherently something an impatient person would not like. That's not right. You can both like short lines, and like FP+, because FP+ helps you to get short lines. You have to remember that most guests always waited standby. So this is a big +3 for almost all guests. I get that it's not for you and me, but for most guests, like L and S, it is a +3 over what they would have thought.
Well, okay. But, when someone comes out to ask for advice, to share that you don't like it is not helpful. Or to share that one cant like it unless you're patient and don't mind lines isn't helpful. Many impatient people, myself included, find great benefit in it.
Ok so why do you think they'll hate FP+? You acknowledge right up front their challenge is not FP+, it's that they're going in March, and you -- like me -- make a point of going in slower times. So right off the bat, your history of going for 4 hours and getting thru a ton would not be doable for them on spring break. Why do you spin this as a FastPass fault? Why not...
Oh man, it'll be so busy that week. I used to go on slow weeks and ride a ton. ? Since there will be wall to wall people, here's what I'd do... in the mornings, the crowds will be going here... you go... there. And....
Why? If I was going, I'd ride a ton of stuff in every park. I just would. I would not accept "a few rides". That is craziness. I'm not going on vacation to ride a few things, and I won't. I just don't understand why you're selling them on getting so little done... It's like you want them to not like their experience before they've even gone. No it's not helping them to "lower expectations" ahead of time, because your expectations are vastly different. You came from a time of FP-, and you learned a very specific way of touring that most guests never did.
If she's been to a Six Flags, she probly gets standby lines. This is what most people will expect as standard.
I think you're getting too complicated. Information overload? No wonder you think it's overly planned. Look at all the stuff you're inundating these newbies with.
Why aren't you presenting this as...
Look most lines are standby, but it's pretty cool because of their new system, you can pick 3 in advance and go right to the front of the line! All you do is download this app, and pick them like this... and then you can tweak the times... or the rides... like this... pretty cool, huh!? Oh... and one suggestion-- try to pick them sooner than later, cuz by about two weeks before, the rides will start getting picked over. Here let's just do it right now I can get you some cool ones! Yes... exclamation point, and several smilies

because you now get to sit down w them and tell them all about Everest, Dinosaur, or all the rides you love. It's that simple. You could be sharing magic but you're sharing doom and gloom. Now FP+ is a benefit they'll look forward to instead of a chore they have to analyze.
Alright, but to me, Disney World is an awesome, magical place that I loved as a kid, loved as a teen, and now share w my kids and love seeing thru their eyes. You seem to be so obsessed with the structure of FP+ and how it's not FP- that you've forgotten the fun. Just look at all your advice: Crowds. Lines. Waits. Problems. Find other things to do. Why do you think they'll only "all in all have a good vacation"... why is your instinct anything short of "
You're going to Disney World -- I'm so jealous you'll have an amazing time!" They probably WILL.