We've never used a plan per se, but more of a direction...
It all depends when you go...We go off season when crowds are thin....then it's direction...
Say the Magic Kingdom, up Main street and left at Casey's to Adventureland...then it's clock wise hitting every attraction as we come to it...out the park when we hit the Castle ( usually noonish, hot and crowded....
Then when we return to the MK, UP Main to the Plaza, right turn to Tomorrowland and counter clockwise to where we left off before...We don't criss cross a park but just go with the flow around....works great for us.