Yes, it is a great tool but you do need to work with a little while it in order to be able to use it effectively. After playing around a little bit more what you might want to do is make your own plan from scratch with the attractions you want to do and breaks/meals when you want to have them.
Planning/integrating FPP reservations can be tricky as well - check out Making Optimized Personalized Touring Plans with FastPass+ for some tips on how to go about this.