The weather is so much better for a March trip than a July trip - so that's a big plus. If Easter isn't in March, the crowds are manageable. Get to the parks early, use fastpass, take a break and then go back to a park. We actually did MGM and MK this past March (separate days) and found the crowds very manageable. Oh - if you can skip the parades, especially Spectromagic, it's a great time to ride BTMRR and Splash!!