You will probably get expert advice by posting your question on the TP forums first, before moving to other communities.
Here is how I use Touring plans:
I goto my Dashboard and build a trip. I enter my resort confirmation number, the days that I am visiting and my planned park days. Once done, I use the tool for room requests to view photos for rooms at the hotel to get an idea of rooms that I would enjoy. I enter those room requests into the tool so TP faxes the resort my request.
Then I view the crowd predictions for my park days. If a park looks really busy, or if I am only visiting a certain park once, I will build a touring plan for that park, based on how I want to tour that day.
I use the reservation finder if I have trouble securing a dining reservation. I have used this feature about 5 times, and have always been able to secure my reservation, so far.
Then I go through the Checklist on my dashboard to make sure that I am not forgetting anything.
Once in the park, I use the lines app to access my touring plan and update it with my LL and ILL times and refresh it. I also monitor general wait times in the app and try to be opportunistic with attractions with low wait times.
Edit: I will mention that the Touring Plans website could use a design update to become a more modern website/user experience. The same could be said about the DIS though. Both site feel very late 90's, and have several questionable navigation experiences.