We went April 2nd-9th this year (week after Easter) and I didn't think the lines were too long. I also used touring plans lines app to choose where to go. Our longest wait was on its a small world and it took an hour and five minutes. Other than that, most waits were around 35 minutes.
Crowds, no matter what size, always seem huge to me, I have PTSD. But the crowds were spaced out far enough (until exiting the parks) that I never felt overwhelmed.