Unless MCU are mainly within the lines of Deadpool and Logan or the Simpsons, you really cannot compare MCU to the Simpsons because they're two different contents that appeal to differences audiences that don't fit with one's other core audiences. As I said, MCU can get away from using bad language and some death scenes, but as a whole, MCU is cookie-cutter and formalic in nature which is suitable and geared towards families and kids. Rremember, Disney bought Marvel to appeal to boys and want to crank out as many Marvel merchadises as possible to its core audiences--families and childrens. They make most of the money off it and it's that success that they keep on going with that and ignore R-rated and risk taking contents for almost a decade like Deadpool or Logan or even Blumhouse horror movies.
You also can't compare Universal to Disney parks, because again they're different. While both parks mainly appeal to families and children, only one has a family-friendly image they have to uphold repeatedly and the other does not. That's why USH can have a permanent haunted attraction all year round, but Disney cannot (as demonstrated by the Alien Encounter and original Snow White attractions which were removed because of parents complaining how scary they were for kids).
It's also the reason Universal has the Simpsons area (an adult-focused oriented content), but not a single such similiar one at a Disney park. The Simpsons's core audiences are not families and children (mainly people who likes clear, clean cut good vs. bad guy like straight out of a kids' cartoon), but for teenagers and adults. I don't see them getting into a Disney park which is always been family and kid friendly in nature, and neither Disney have plans for any meets and greets from Fox adult-animated shows.
All I'm saying is it's really a bad, poor comparision to bring up HM and ToT as comparable to the Simpsons. Compared to Alien Encounter and the original Snow White ride at WDW, the Haunted Mansion and ToT as a whole aren't really edgy or explicitly scary enough. They have horror elements, but really suitable for kids (like the Haunted Mansion movie in 2003). As a kid, I can adjust well into the Haunted Mansion and ToT at Disneyland and DCA respectively, but definitely not the Mummy or Van Helsing maze at USH because of the dark, graphic, and scary nature of these mazes. Sure, there are some dead bodies hanging and the like in HM, but it fits well within the Disney's general formula (and along the lines of their animated shorts/movies from the 1930s to 1950s) and not to the level of HHN where they are scary and dark atmosphere something and gore and graphic characters everywhere. It's the reason why Universal can have HHN and Disney cannot.
Also, regardless of whether it's on primetime or not, The Simpsons's core audiences are not families and children (mainly people who likes clear, clean cut good vs. bad guy like straight out of a kids' cartoon or Muppets), but for teenagers and adults. If they are, they would be as equally as comparable to Spongebob, Johnny Bravo, Scooby Doo, Disney channel shows, but they're not. The primary reason the Simpsons runs at a later as well as FOX and the evening to night on FX is because of its focus on adults. Futurama and King of the Hill suffered the same thing, but because their shows are more violent, more graphic, and more sexual, they had to explicitly point out they weren't meant for children and families specifically.