Didn't know Uncle Walt was his own pixie duster trying to pass off his anemic lands as fully developed lands...
In the first five years of Disneyland, Fantasyland had 8 rides.
Frontierland, however, only had three "rides" (which were all boat rides: Riverboat, Columbia, canoes)
And Adventureland and Tomorrowland each had only one ride.
At modern WDW, Adventureland only has 3 rides because a spinner was relatively recently shoehorned into it. Frontierland only has 2 rides, unless you want to count Liberty Square's Riverboat as belonging to Frontierland, in which case that would leave Liberty Square with just one ride.
You know who else is a pixie duster? Universal!! At the opening of each of the Potter Lands, they only had two rides. To date, Diagon Alley's second 'ride' is the train (which is just a *box* pulled by a wire!!!).
Most of Epic Universe's lands will open with only one or two rides.