You all are making me less nervous. We have never been during a "busy" time. However, it was either the last week of March or hold off another year. I needed my Dole Whip fix! So, it sounds like having a decent plan in place and making sure to keep checking FP options, we will likely have a good time. We have been multiple times and feel like we have pretty good strategies. We couldn't get 7DMT FP so we will try to rope drop it. Same for SDD. Other than those, we have FP for the other headliner rides and hopefully refreshing the app we might be able to score some decent afternoon FP.
We typically do two MK days, and one day we start on one side of the park and focus there, and when we get done we venture to the other side. On our second day we start on the opposite side and do the same. We book our FP and plan meals around this strategy. We went in June of 2017 and it worked very, very well for us.