With the exception of Magic Kingdom...you'd actually be hardpressed to find 10 things to "ride" (and watch) in the other WDW parks.
EPCOT is kinda a different animal...so while there is plenty to do...it's hard to apply simple numbers to it.
but mgm and animal kingdom don't really offer much more than ten...and that's with everything.
lets count:
studios
star tours
the indy show
american idol
lights motors action
midway mania
little mermaid
playhouse disney
tower
rock n roller coaster
muppetvision
beauty and the beast
yeah...that about covers everything...and that's 11
animal kingdom
kilimanjaro
Flights of wonder
i guess you can count the train
festival of the lion king
tough to be a bug
kali
everest
CTX
triceratop spin
primeval whirl
nemo show
??? that's 11
so that number is not surprising...cause that is the only thing you realistically can do.
and besides...the number of rides/shows attended is not the problem from disney's standpoint...it's that wait times aggrivate customers and affect them in their other daily activities...and you know what that means?
they will probably spend less...and that is the primary goal. the other is to get you to fly back again.
any other consideration is not relevant.
so they want you happy so you shop....where the money is made
here would be their ideal park if you let them (and let's face it...we have been letting them):
2 rides
2 shows
5 eateries
100 shops
50 character greets/ photopass ops
25 "have you heard the secret?" DVC info desks/ tour peddlers
stroller/ wheelchair rental.
there you go...the accountants...errr...i mean "magical" plan. Walt's vision 2.0