We went June 5-12 last year. More crowded than our May 2017 trip, but it wasn’t bad. We worked our Fastpasses and basically never waited more than 20 minutes for anything. No or very short lines at food stands etc. Rope drops were definitely busier, but we managed to successfully get on all our “rope drop” rides walk-on.
But it was sooooo hot. Granted, it was a heat wave. I would never do June again. I feel like our whole trip we were rushing around to get in the park, out, ride to ride and not die lol. That’s even with fans,
cooling towels, hats etc. I feel like we couldn’t just enjoy ourselves/people watch/take it in. If we ever go again it will be a different time.