Get to the parks before rope drop, use FastPass and you'll be fine. Lines for major attractions will build to the 45 - 60 min level in the afternoon but by then we'll have hit the E-Ticket rides and hopped to the seat shown below.
We were there this year 3/15-3/12 and had very low crowds. We didn't have to use FP until the last day of our trip when kids arrived for a competition. We didn't have to wait more than 20 minutes on line for every other day!!!