Since it became available, I have always used WDW Lines. I have found its wait time estimates to be very accurate. A new feature available with Lines is a customized touring plan. You pick the attractions you want to see, the day/date you want to tour, and the starting time. The server backing Lines will then optimize your plan based on historical data and can update it throughout the day with current data. If you follow the plan and do updates where WiFi is available, you can avoid mobile data fees.