Short answer? Maybe.
We did a June trip (end of June), crowd levels 8, and 9s by the end (days before July 4). We were told by most here that touring plans were crucial to our trip, we couldn't possibly have success without them. So, I spent hours perfecting our daily touring plans.
We threw them out after the second day.
My thoughts?
Touring plans are great, if your only/main goal is to cram as many rides in as possible. If that's what you want, then yes, they're great.
But, if you actually want to be able to experience Disney, to stop and smell the roses, to enjoy the unexpected moments etc... then they're a waste of time quite honestly.
My advice is this: figure out which park you want to be in each day, look over the rides, decide which ones are must dos, and plan your FP+ accordingly. Get an idea of the park layout so that you're not running back and forth all over the place and arrive at rope drop. And really, that's it. Enjoy!
Our best memories were the ones that were not on the touring plans. Honestly, the rides are such a small part of what makes Disney, Disney. It's the details, the unexpected moments: like when we saw a cast training session character meet and greet, like when the kids saw Jessie & Woody and decided to stand in line 45 minutes to meet them, or when they saw Alice and the Rabbit and wanted to meet them, like when they decided to stop and play checkers on Tom Sawyers Island instead of rushing off to the next ride, or when they wanted to stop at every PhotoPass place possible for magic shots
Catching the tail end of Dream Along with Mickey and stopping to watch that, instead of going on the ride, wanting to ride Tomorrowland Speedway twice in a row, or trying the Sword in the Stone and ending up getting a photo session with PhotoPass, being able to have a sword fight with the Tremaine family (I think that's who they were, lol). THOSE are the things that made our trip magical, being able to stop and let the children experience the magic when they wanted. There are just so many things that you can't plan on.
The first couple days I tried to keep us "on schedule", and it wasn't nearly as fun. In fact, just the other day this came up. We were talking about Chip n Dale and how the kids wanted to meet them. My son pipes up, "I saw them there, at Epcot! I wanted to meet them." I said, "Why didn't you say anything?" His answer? "You were rushing trying to get to a ride, and I was just trying to keep up." Yup. Real magical.