Sorry, but it's 100% the exact opposite. Denial ain't just a river in Egypt. You have once again been duped by the time that you think you have saved in random attractions. You did save time on whatever attractions you had a FP assigned to you, but if you want to see anything else you will quickly lose that saved time because of others that have FP and making you stand in that dreaded standby line. Without FP you would have used the same amount of time to see more because you didn't have to deal with the road block on the standby line caused by the multi car wreak that is the Fastpass line.
I don't think the math supports that idea. For the sake of argument, let's assume that there are 10 attractions you want to go on in a day, and each one has a 60 minute wait-time pre-fastpass. That means you'll spend a total of 10 hours in line for those 10 attractions.
Now let's say the park implements FastPass+ and you get FastPasses for 3 of those attractions, and that FastPass increases all Standby lines by 10 minutes (which is at the upper range of what all analysis has shown).. And let's say each FastPass attraction you spend 5 minutes in line. That means you will now only spend 505 minutes in line total, which translates to an additional
1.5 hours not spent in line.
That's a contrived example, and it's impossible to do a completely accurate one, but here's one that's less contrived. Let's take a real date (I picked, completely randomly, October 5, 2019 at MK, again using TouringPlans data and the average wait time for the day
https://touringplans.com/magic-kingdom/wait-times/date/2019-10-05)
Let's again assume that all attractions would be 10 minutes shorter if FastPass didn't exist (again, this is at the upper range of what the TP analysis has shown).
So, the assumption of pre-FP would look like this:
7 Dwarfs | 84 |
Big Thunder | 38 |
Buzz | 39 |
Dumbo | 20 |
Haunted | 50 |
Small World | 20 |
Pirates | 36 |
Space | 73 |
Splash | 67 |
Pooh | 23 |
Total | 450 |
So 450 minutes, or 7.5 hours. Now let's say with FP, you add 10 minutes to each standby line, but you get FastPasses to three attractions. For the sake of this exercise let's even imagine that I was staying offsite and couldn't get a FP for Mine Train, and I'm just getting it for some random attractions. I'll pick Big Thunder, Haunted Mansion, and Pooh. What does that look like?
7 Dwarfs | 94 |
Big Thunder | 5 |
Buzz | 49 |
Dumbo | 30 |
Haunted | 5 |
Small World | 30 |
Pirates | 46 |
Space | 83 |
Splash | 77 |
Pooh | 5 |
Total | 424 |
Saves nearly a half hour, even with those meh FastPasses. Swap Pooh for something a little better like Pirates, and you save almost 40 minutes. Swap it for one of the other E-Tickets like Splash or Space, and the average guest can save quite a lot of time.
7 Dwarfs | 94 |
Big Thunder | 5 |
Buzz | 49 |
Dumbo | 30 |
Haunted | 5 |
Small World | 30 |
Pirates | 46 |
Space | 5 |
Splash | 77 |
Pooh | 33 |
Total | 374 |
In that scenario, you spend one and a quarter hours less in line than you would have with standby only, and that's assuming that standby lines all increase as a result of FP+. And that doesn't even take into account additional Fastpasses, skipping some rides because of lack of line tolerance, getting some short wait times at park opening/closing, etc...