My son saw a pediatric OT for about 18 months for this and other physical (balance, coordination) issues. It was quite helpful to him. And yes, it obviously exists as you know if you have a child who has it! It is true that many of the therapies (music therapies, etc.) are new, but the basic therapies (brushing, sensory diet, exercises, etc.) are pretty well established, well understood by occupational therapists, and have been used to help many different disorders for many years (my son also has ADHD, and the therapy was very helpful in helping him to control his body, although the attention issues were still problematic for him.)
Our OT did a series of tests initially (it took one afternoon - a couple of hours and about $250) that measured his sensitivity (as reported by us) and several different types of physical tests - large and small motor, and eye-hand coordination type stuff - scaled against other children his age. I can't remember the name of any of the tests offhand, but I think they were standard tests that any OT would probably use. At the end of treatment the tests were repeated and we got all of the results. The sessions were covered as physical therapy by our insurance, up to 30 visits per year. Our OT was very flexible with regards to how often she saw him and for how long (it was her suggestion that he "graduate" - we didn't want to stop because he loved OT so much.)
I'm not sure what sort of information you were looking for, but that's the basics, I guess. We used brushing the first few months, about 20 minutes of nightly exercises, and every-other-week visits as his "sensory diet." We also tried some of the music therapy (our choice), Handwriting Without Tears for small motor (as well as other things during the visits), and something called Rocket Training for balance and vestibular issues (all at OT). The OT gym also has tons of large motor things they used during the visits, depending on the needs of the child.
It's been about 2.5 years since we first identified some of his oddities as sensory-related, and most of those things he now deals with pretty well. There's really no way to tell if he would have eventually "grown out of" some of that stuff, but OT made him feel happy and grounded and in control, and gave us all some concrete answers and strategies, as well as advice we could give to his teachers, so it was well worth it.
Good luck!