I would say not necessarily.
It depends where you are staying and what time you plan to get to the parks.
We were at Emerald Island last Easter, drove to the parks everyday - but got there for opening time (or as close as we could make it, maybe 5 minutes later). We had little to no traffic. We did use the Sherbeth Road entrance to help us.
We also took advantage of the services of tour guide mike and managed to do all the major rides & attractions before the crowds got too bad. We were home mid afternoon for a swim and a rest before whatever plans we had for the evening.
For Easter I would recommend getting to the parks for opening time to get the most out of your day. It is hard getting up everyday for that, but well worth it, when you realize what you managed to achieve before the main crowds arrived at the parks.
BTW, we found that the "Dream Team" were often giving out Dreams around 10am, so getting in early had its advantages. We as a family got dream fastpasses one day and the mickey ears another day. Narrowly missed out on another dream, but you can't be gready

These dreams were given out early morning around 10am 'ish'.
Enjoy.