We just returned from a five day trip to DLR. We did not care to be the first ones into DCA at 9:00 on Friday. We went into DL at 8:00 AM instead and other than Matterhorn issues, were able to ride numerous rides with very little wait. We used FP's to make life easier on the more popular rides. The crowds built as the day went on.
At 3:30 we went into DCA and Carsland. Yes it was crowded but you could move with the flow and shop for merchandise with short waits outside the stores. We were able to ride RSR three times using the single rider line. The actual wait was no more than 40 minutes each time. The single rider line would be my advice until things settle down or you can get in early or get fastpasses. I had one gentleman tell me our single rider wait time was shorter than his fastpass wait. Also rode with a nice family of four who said they were in line 6, yes 6 hours, the ride went down twice while they were waiting. If there are two of you in the SRL, chances are good you will ride in the same car, since parties of 2 and 4 are the most popular groups. RSR/Carsland is/are just amazing, especially at night. The Buena Vista Street area is also outstanding. DCA my new favorite theme park.