Touring Plans and EasyWDW both did studies showing wait times increased from 2013 to 2014 and from 2014 to 2015. Obviously someone is waiting in those lines of they're growing and it's not the people who known how to game the system. It's the typical guest who may or may not pre-reserve their 3 FP and then move around at peak times. Lines only get longer if someone is waiting in them and the average guest isn't going to know the ins and outs of avoiding lines.
Yes, I am fully aware of those studies, and I know that they said that standby lines at SOME attractions increased from before FP+ to after FP+. I have always acknowledged these studies and their conclusions. There does seem to be some disagreement, though, about how much those standby lines have increased and how they affect guests. It's always interesting to me that some people want to quote these studies as the proof that standby lines have increased, but then seem to want to ignore their conclusions about how much the lines have increased, and that lines at some attractions have gone down.
The same guests who don't know the in and outs of touring are also the ones who would be more likely to be standing in the long lines at the major attractions (if they can't get a SDFP for them). So, to them, a 10 minute longer wait for POC and a 13 minute shorter wait for Space Mountain is a net positive. More experienced guests may just focus on the longer wait for POC because they aren't going to wait in a long line for Space, whether it's 75 minutes or 60.
I think many people here stay in the bubble of the tricks and best case scenarios they learn and not consider what their first trip was like which is typically an average guest experience. I know that for some their first trip came after they came here and got tips but is suspect that is a very small number of first time visitors.
I agree with your statement, but am not sure what point you are trying to make with it.
If you are trying to support an argument that average visitors are spending more time in standby lines than they would have with paper FPs, or no FPs at all, I don't think you can do that. Jennytoon mentioned above some of the different family/travel group factors that affect how different people tour the parks. Even within your example of a group that arrives in late morning with no advanced FPs and stays through the fireworks and then leaves, there are going to be a lot of variations. That group might get FPs first thing when they enter the park or not get any all day. They might be mostly interested in Fantasyland rides, character greetings, and some of the anytime attractions, or they might prefer the mountains. And, maybe most importantly, the overall crowd size that day is going to have a significant impact on what they are going to be able to do and how much they will be waiting in lines.
I really think it is fruitless to generalize to try to support an argument that, not only do you hate FP+, but that FP+ has a negative impact on the majority of guests and, therefore, represents a big mistake on Disney's part. I think it makes more sense to focus on the reality of what is going on in the parks and let people decide for themselves how they feel about it.