I've used some of DTB recommended itineraries to help with G+ when the system was first in use and needed some recommendations for one day itineraries. It was fairly helpful and allowed me a little bit of an edge when the system was newer. I think they could still be beneficial however, do keep in mind, he and his wife test this as one person, not a family trying to navigate the ins and outs. I found some of his recommendations a little overzealous even before I went, since it's easy to run all over creation when you're by yourself, not fun when you're with a group of ppl and tbh, not how we usually tour parks. He sometimes acknowledges his criss crossing and poorly planned navigation in the interest of maximizing G+ but the recommended itineraries aren't usually as ambitious. He will also usually update them based on G+/iLL$ changes.
I still use TP as it's more interactive based on my own recommendations and selections but I like using a few resources and tools to help plan.