MulanMom- No, I didn't do a full comparison for the other parks, though by "eyeballing" it, there is a difference. Not too much with AK. Epcot made the change you alluded to, which only effects some people, depending on how they work their way through the park. MGM also had a small difference.
Somebody (you?) had pointed out the timing of Easter as being a factor in the small change in March, and I believe this is correct. An "eyeball" of April does show a bigger difference. May is not posted yet, and I believe that's because Disney is still evaluating attendance trends.
I don't dispute that there has been a decrease in hours. But it's pretty much in-line with the 10-15% drop in attendance cited by Disney, and other Orlando tourist-reliant attractions. Now, when attendance picks-up, I would expect hours to increase. If that does not happen, my opinion on the situation would change.
Also, its important to note that Disney parks are still open longer than Universal (exception-Animal Kingdom), even though they charge the same admission price. They also offer more parades/shows. Sea World even raised their prices last week. I know, Universal has a few more discount opportunities for mulit-park/multi-day tickets, but you also get fewer operating hours and attractions/restaurants that are not even open when the gates open. I'm not coming down on anyone, just pointing out that if you really want to get the best value, you have to look objectively at the entire picture, not just Disney's cuts. If you do that, and decide you want to stay off-site, or skip Disney altogether, that's great. Disney will get your message loud and clear.