Very good point ... and take it even further ... look at MK, Splash Mountain (and all that capacity) was closed for two weeks ... right across the way Pecos Bill Cafe (the second largest quick serve facility ... actually it may be the largest now with all the seating it added) has been closed as well ... labor cuts at the parks have reduced capacity at attractions as well ... and even things like HoP being closed means more people in the walkways ... it absolutely doesn't equate with actual attendance.
You can very easily make a day where 25,000 people are in the MK feel like there's over 40,000 by all of the above ... plus FastPass.
Go to Epcot ... on a recent day you have Energy closed, TT down, half of Mission Space's more popular orange side closed and, let's not forget, WoL rotting away ... do you know how much capacity that is? How easy it is to make even a relatively slow day appear far more crowded.
Disney has done well (relatively speaking) on weekends thus far in 2009 ... one weekend was the end of the Christmas holiday season ... the next weekend was the Disney marathon ... the next a three-day holiday MLK weekend ... the crowds during the week haven't been there, no matter how it has felt to anyone.