All parks around the world (I've been to probably 100 or so), have strategies that allow you to maximize your fun. RD is a critical part of ALL of them.
Visiting on a non-Saturday or non-busy day is also a universal requirement.
Problem is, FP+ essentially makes ALL but the absolutely dead days busy days. Since they always bribe people into their rooms, they run pretty high occupancy rate. If they have an 80%+ occupancy on any given day, with FP+, you won't be getting many big rides in. The math hasn't changed, and is still horrible.
25,000 rooms times 3 people per room times 3 FP+ times 80% = 25,000*3*3*.8 = 180,000 FP+
Major rides that historically had long lines:
MK - Splash, BTMRR, Space, and (NEW) (Likely highly overrated) Kiddie Mine ride
EP - TT, Soarin
DS - Tower, RnRC, TSMM
AK - Everest, Safari
That's 11 rides. Each one averages a very optimistic 1500 people an hour. Take 12 hours, at 100% FP+ availability, you get 198,000.
The observant reader will note that 180,000 is pretty darn close to 198,000, and probably close enough, taking downtime and other factors into consideration.
This means everyone could theoretically ride all the BIG rides at the park they are visiting. HOWEVER, that assumes park attendance ratios with major ride availability. It does not, and that is why I assume EP, DS, and AK will ALL be tiered and you will only get ONE major ride per day, and the other two rides will be only available via long standby wait.
That means that even a Monday in early May will have very limited access to the E tickets. However, a Monday in May at any other park open then will be a VERY good day to get lots of short wait rides.
You will also note that this is for a 12 hour day. Occupancy drops as park hours do, but not proportionally, so the "off season" won't have better availability.
OH, AND REMEMBER, THIS IS ONLY FOR DISNEY RESORT GUESTS!!! And since they only compose about half of a days attendance, all of these numbers, as horribly as they look, are actually twice as good as reality!!!
Oh, and I forgot Peter Pan
This isn't opinion, it is the math behind the atrocity that is FP+.
(Universal, feel free to hire me as a consultant)
Oh, and I would LOVE to see the math where FP+ will be giving me more than what I get now. I will not accept "it moves people to other rides, decreasing standby on others" as an answer, since it is essentially unprovable.
Jason