We have previously visited WDW during the weeks before and after Easter and have enjoyed ourselves completely. If you read the boards, research and complete your park/ADR plan well in advance, you should be fine, too. In fact, we will be there this year from 3/21 thru 4/5 (although we plan to do our "commando" park touring during the first 10 days, then spending more time at the resort toward the end).
Once you decide which days you will be there, check the schedule of park hours(available on the WDW website, or here) and EMH schedule. With young kids, you will want to use the early EMH as much as possible and try to get a rest/nap break in the afternoon. The parks are open longer around Easter, so you can really fit a lot in one day(if your family can handle it, that is!) We like to get park hopper tickets so we have the option of using the early EMH, then resting when it gets busy(usually by noon), then going to a non-EMH park later(with the hope that others have not purchased the hopper option and will stay at the EMH park...seems to work for us
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We also make sure to utilize the Fastpass system as much as possible. This usually involved sending one person ahead with all the tickets of our party(all you have to do is get inside the park, then the "runner" can head to your first choice ride and get passes for everyone) while the rest of the group could take their time checking out other attractions/rides. It took a while for my husband to accept that this plan worked(he does not like to split up, some hidden childhood fear of getting lost or something
You also may want to check out Disboard Sponsor Tourguide Mike to get additional ideas.
Having visited other times of the year, Easter is really not my first choice, but given the length of winter in Wisconsin, I have to get out of town for warmer weather and try to do it without my 2 kids missing a whole lot of school. LIke I said, we still have a great time, and I'm sure you will too!!
