The Themed Entertainment Association have just released their 2009 theme park attendance report. Whilst the figures are in large parts estimates, they are the closest we get to attendance figures for the major parks world wide.
Disney parks world wide occupied the top 8 positions, with just Disney's California Adventure missing out on the top 10 and landing in position 11. The US Disney parks all showed increased attendance from the previous year, with WDW's Magic Kingdom holding the number 1 spot with 17,233,000 visitors and a gain of 1% over 2008. Epcot comes in at number 6, Disney's Hollywood Studios at 7, and Disney's Animal Kingdom at 8.
Typhoon Lagoon and Blizzard Beach occupy the number 1 and 2 water park attendance world wide.
You can read the full report at http://www.teaconnect.org/etea/2009report.pdf