The purpose of the other three gates was to purposely be light in rides because they had other attractions which weren't rides: Epcot has the World Showcase, DAK has a zoo, and DHS has shows.
And just because there are rides, doesn't mean they're good rides. It's not that a ride is inherently better than any and all non-ride attractions. Get A Horse is more entertaining and a better visual treat than Soarin'. FotLK beats the two rides at DinoRama. American Adventure beats Nemo Ride. HEA beats half the rides at the MK.
Now, are all the shows and non-ride attractions top notch? Nope. But they are really good ones that complete the theme park experience without it being just going from ride to ride to ride.
I do welcome the addition of more rides. I'd also welcome the addition of new top-notch shows (or at the very least, replace the old tired ones). But it would be wrong to say that there is any conditioning on the part of WDW for people to accept parks with a low number of rides because WDW was counting the number of *attractions* and not just rides.
DAK wasn't built for the repeat customer there every week who's grown tired of the zoo and the Nemo Musical and just want's to ride a thrill ride over and over again every trip.
I can't agree with the general sentiment of your post. Don't get me wrong, I'm not trying to knock the non-ride forms of entertainment Disney offers. I love the shows and 3D movies and animal exhibits, etc. My issue is with these options serving as
replacements for rides, rather than complements. MK has plenty of non-ride attractions - 4 animatronic shows, Philharmagic, MILF, ETwB, FoF parade, Sawyer, etc. But they also have a ton of rides.
You are right that a ride is not guaranteed to be better than another form of attraction (though I believe 99% of Epcot's guests would disagree with your preference for GAH over Soarin'). But there is something unique about a ride that other forms of entertainment don't offer. In fact, I would argue that having rides is the defining characteristic of an amusement park (of which "theme parks" is a subset). In other words, if it doesn't contain rides, it's not an amusement park. The same cannot be said of shows, movies, games, dining, or shops, which are really separate categories of entertainment in their own right that are used to help fill out an amusement park.
It's certainly true that not all rides appeal to everyone, which is exactly why there needs to be a large quantity. Storybook Circus and Dino-rama have similar ride offerings, but way more people complain about the latter because they don't have alternatives at AK. What makes MK better than the other parks is that there is enough to do for just about everyone.
But you don't have to take my word for it - the attendance numbers prove that the shows at DHS, animals at AK, and WS at Epcot are not doing enough to compensate for those parks' lack of
rides. You love to point out that the shortcomings of those parks are a major factor behind the overcrowding at MK. I absolutely agree, and that's why they need to continue adding more rides.