Easter only matters to a point. Some school districts map their schedules around Easter. Others make it the same week every year regardless. Most of those dates will fall in March, even if Spring Break is late April.
All Easter does is make April more crowded, if that's when it falls.
To my knowledge, ************** is the only website that actually predicts crowd levels for an upcoming year for free and they predict that the crowds during the week starting March 7th (41st best) as a bit more crowded than the 14th (37th best).
Since Easter is on April 4th, the absolute highest spring break crowds will be the weeks immediately surrounding it, but the other weeks in March will still be extremely crowded, but they will drop off significantly starting on the 11th of April.
Anyways...the difference in March is probably not hugely noticeable.