The crowds are pretty large at Easter. That said, we have gone to Disney every Easter for the past 12 years so it hasn't stopped us. You just need to plan your trips to the parks. Go early, even at Easter the parks aren't bad when they first open. When the crowds get overwhelming go back to the hotel, swim, take a nap, enjoy a relaxing lunch. We then go back to the parks in the evening. One trick, try the bigger rides during the night parades. Definitely get fast passes.
There are benefits to going at Easter. The parks are open later, MK usually till midnight. The weather is great. Easter is late this year so it might be a little hotter, but Orlando in the summer is BRUTAL. We haven't had much rain(I shouldn't say that, it might tempt the gods.) In the summer you get an afternnon shower every day.
Enjoy Easter, we'll be there.