I read these boards a lot, and I have next to no idea where you are getting the “stupid complainers want thrill rides, not family rides” strawman. If anything, I think the sentiment on these boards is that WDW would benefit from new, lengthier, family-oriented AA-reliant rides of the kind on which the Disney parks built their reputation. Instead, Disney is preoccupied with extremely short, quite similar roller coasters that exclude portions of the guests in the park due to age, height, weight, or constitution.
And who gives a hoot if a Disney coaster meets the physical thrill standards of a Six Flags or Cedar Fair coaster? Those kinds of thrills are cheap, and there are a lot of places to get them - like Six Flags and Cedar Fair parks, which are much more numerous and easily accessible then Disney or Universal parks. Disney and Uni are supposed to offer something different (and yes, I’m shaking a very vigorous finger here at Uni and their disappointing JW coaster project).
Here’s a valid criticism of my position: I rail against the redundancy of GotG, Tron, Space Mountain, RnRC, etc., yet I would be more than happy with the construction of a dozen new Fantasyland-style dark rides - or the revival of the omnimover extravaganza of classic EPCOT. There’s some hypocrisy there. But in rebuttal, I’d argue that, in contrast to longer, show-scene heavy attractions, coasters in the dark with lighting effects don’t have a lot of tricks up their sleeves. There’s not a lot of there there. Toad and Snow White are in many ways quite similar, but their tones vary significantly - from the whimsically comedic to a traditional fairytale grimness. What’s more, coasters of the type WDW is obsessed with provide very little room for storytelling. One of the Disney parks’ great innovations was to see attractions as fundamentally narrative. Even thrill rides like Star Tours and (bracing for impact) Gringotts provide more engrossing stories than Disney’s dark coasters. So in the end, without story or tonal variation, Tron and SM really are just coasters in a warehouse with blinky lights.
Oh, and as to the basic premise of your post, that those ungrateful Disney fans complain about anything? Bring Mystic Manor or Shanghai Pirates or even Tokyo Monsters over here and see how many people on these boards complain.