I mean, the running joke around here is that Dorney doesn't get lines because it's always dead because everyone's in the waterpark. And it's an easy joke to make, a nice simple target to punch down at. But it's not really true.
Here's the Queue Times data from last year's 4th of July, which was a Sunday with moderate weather:
https://queue-times.com/en-US/parks/69/calendar/2021/07/04
This tracks with what I experienced when I visited over this past Memorial Day weekend -- average wait times between 20-30 minutes for most major rides and coasters in the dry park, sometimes getting up to 45 minutes, and you might as well just skip the wild mouse because there's absolutely no reason to wait an hour for that ride. But it's definitely not a case these days where you can just waltz into the park and expect walk-ons on everything anymore, especially not on a busy holiday weekend with nice weather.