While USH and DLR aren't particularly comparable, this weekend is especially out there. It's a holiday weekend with a half marathon and the close out of a hugely successful 15 month celebration. If DLR wasn't packed to the gills, I'd be concerned.
If we're comparing the weekend itself, perhaps it's time to be concerned. Although the roads around DLR were a mess in the mornings due to the races, the parks themselves were practically empty. Most of the APs were blocked out, so it was pretty much just the tourists.
The longest waits I saw were 75 minutes for Space and Racers, with most of the headliners in the 25-40 range; the longest we waited was about 35 minutes for Indiana Jones. We did the brand new Soarin' twice with FPs (available about 45 minutes out, with a 35 minute posted wait), which really seemed to drive the point home. Rivers of America, Haunted Mansion, the Railroad, and Mr Lincoln were all closed, but the walkways rarely felt busy
We ate 5-6 meals in the parks and only had to wait to order once; the other times we just walked straight up to the cashier. It was incredibly convenient (especially after some painfully slow experiences in the past), but was a real shock. It was even pretty painless to find viewing spots for Paint the Night and Forever on their penultimate night
Through a weird twist, the crowd levels have been inverted in recent years and depend more on AP blackout days than traditional holidays and big travel weekends. As someone who can realistically only make it to the parks during holiday periods, I appreciate it (especially for how much I pay per hour in the park compared to an APer), but it just feels backward
I also think that the regular ticket pricing is starting to scare a lot of people off. Although I travelled across the country specifically for Disney's races, this was the first time we've had a serious (and fairly last-minute) discussion about whether it was worthwhile to even go to the parks. We ultimately bought the tickets, but I suspect we may take a different approach in the future.