It really depends on what you want to do, and where you are in the RD line. The following are my EMH experiences from Jersey Week 2018
AM EMH at AK. Got first bus out of Pop, were maybe 10 people back in front of "our" turnstile to enter park. Went quickly to Pandora (with older kids who know how to keep a move on, so no strollers or anything to deal with), where we were first on FoP, then went on NRJ and were hitting the bathrooms by 8:10. We then did EE twice, Dinosaur, and were walking onto Primeval Whirl by 9 when the park opened. Headed up to Safari, which we rode with minimal wait, and then over to walk on Kali. We left the park by 10am, having done all rides other than Bug's Life and Triceratops (no interest, but easily could have).
AM EMH at EP. Rope dropped from IG, and were towards the front of that crowd as we hurried to TT. Rather long wait by the time we got there (from those entering at front of park), and then we decided to ride again single rider line, but wait time ended up being much higher than posted time. Despite being there early for RD, we only managed TT and single-rider TT in that hour.
PM EMH at HS. We lucked out, sort of, as it was POURING rain. Like by the time we got from the bus to the entrance, we were completely and totally drenched down to our underwear. Could not have been wetter if we jumped in a pool. As a result, crowds were much lower than they would have been. Rode SDD with about a 15-20 minute wait, then AS2 twice, then TSMM (once or twice?), then hopped back into line for SDD just before closing and waited less than 5 minutes.