I love Touring plans and I'm not sure how first timers plan without it.
On my first trip to WDW last year I had no frame of reference and was totally lost trying to plan my days. I had no idea how short or long the lines, rides, and shows were going to be and I had no idea how long it was going to take to get from point A to point B. This made it very stressful for me to try to plan around ADR's, FP+'s, set times for shows, parades, and fireworks and just figure out my plan in general so I wouldn't be backtracking all day.
Because Touring plans gives estimated walk time, wait time, and ride time for each ride I found it much easier to plan my days. I loved how easy it was to select all the rides and shows I wanted to see and then just slide everything around until the times worked around those set places I needed to be (ADR's, FP+'s, Parades, Fireworks) at set times. I built a few half hour "breaks" into each day just in case I fell behind or they under predicted times but found their predictions pretty close.
I'm sure most of the information could be found online for free but for me it was well worth the $10 to have it all in one place in a format that was so easy to use.