I love the content and touring plans on the website, touringplans.com. It's $18 to subscribe (gives you access to the touring plans for a year, but well worth it IMHO. When you are paying so much for tickets, something like this that helps you make the most of your day I think is great. I love it that they track ride closures, fast pass policies, opening times of parks, etc. (great place to go for the latest information). I usually start with one of their plans for my park day and then add or subtract things based on interests, how long I will be in the park, and what it looks like I can fit in based on crowds. I make sure to have some slack time in there at the end of the day to maybe do something a second time or get to something I really wanted to do that I didn't get in, or to just sit down people watch or stop in Disney gift shops, whatever. The description of attractions, etc. helps me decide what to do and what to skip. The line estimations do that too.
Having a detailed plan makes things pretty mindless and easy when I get to the parks and we can just enjoy ourselves with decisions of what to try next, do next already made. Also, I don't hesitate to deviate from the plan or spend a little more time and smell the flowers. I can always skip something on there that I don't care about as much. But for me, I love having the plan as a roadmap. It's nice to hear their opinions of the best things to do, given that you only have so much time, etc.
If it were a non-Covid year, I'd recommend the book, "The Unofficial Guide to Walt Disney World" by the same team, but with so much in flux and changing all the time, I think during these COVID-19 times, I'd just do the website subscription.