And even then, the last two parks Disney opened in Orlando had 2 and 3 rides *in the whole park* respectively.
You keep tying something being amazing to ride quantity. Name me the lands in Disney World that opened with more than two or three rides in the first year? I'll give you a hint: there's only two. Let's go down the list.
MK
Main Street: 1
Adventureland: 1
Frontierland: 1
Liberty Square: 1
Fantasyland: 9
Tomorrowland: 1
Epcot
Future World: 6
World Showcase: 1
DHS:
Hollywood Blvd: 1
Sunset Blvd: 1
Echo Lake: 0
Studio Backlot: 1
Toy Story Land: 3(2)
Galaxy's Edge: 2
DAK
Africa: 1
Dinoland: 1
Asia: 1
Pandora: 2
So when exactly was this golden age where Disney would build these large lands with many rides? In 50 years of WDW, no land has has more than 3 rides opening year except Fantasyland in MK and Future World in Epcot.
If anything, they seem to be increasing their initial ride count. Historically, almost all lands opened with one ride only. Now we have 3 new lands in the last few years, each with two new rides.
Also, when was the last time we got three new lands in 4 years?