Since I write a lot about the non Disney Parks, let's look at Attendance in Orlando pre Potter in 2009 vs. today to show growth at all the major Central Florida theme parks.
IOA
Attendance 2009: 4,627,000
Attendance 2012: 7,981,000
Difference: 3,354,000
% of Growth: +72%
USF
Attendance 2009: 5,530,000
Attendance 2012: 6,195,000
Difference: 665,000
% of Growth: +12%
MK
Attendance 2009: 17,233,000
Attendance 2012: 17,536,000
Difference: 303,000
% of Growth: +1.7%
Epcot
Attendance 2009: 10,990,000
Attendance 2012: 11,063,000
Difference: 73,000
% of Growth: +0.7%
DHS
Attendance 2009: 9,700,000
Attendance 2012: 9,912,000
Difference: 212,000
% of Growth: +2.1%
DAK
Attendance 2009: 9,590,000
Attendance 2012: 9,998,000
Difference: 408,000
% of Growth: +4.2%
SW
Attendance 2009: 5,800,000
Attendance 2012: 5,358,000
Difference: -442,000
% of Growth: -7.6%
So when you look at growth since 2009 at all the major Central Florida parks, you see that not only is IOA's growth incredible, but the fact that they have been able to maintain that growth... this year it is up 72% from 2009. Where as Disney has been roughly flat.