I agree with both the above. Over the weekend, just walking around the park, the crowds were quite bad - it felt stifling to me. But the ride times weren't all that bad -- 30 minutes max, like Vaughn said. We got FPs for Space and HMH, but walked onto BTMRR in 15 minutes and Indy in 20 minutes! Did Matterhorn in the AM before the crowds arrived - that was 10 minutes.
Today we went to DCA, and it was deserted. Walk-ons to 15 minutes max for most rides.
-Bob