Several good tidbits in this thread. Son follows the Driveline program, at least 50 percent of which is focused on post-throwing recovery. Most of the modalities track the Texas Baseball Ranch ideals with a fair bit of post throwing activities (shoulder tube and plyocare drills, especially rebounders for the latter, band pull-aparts). Then a combination of voodoo flossing protocols and stim using the Marc Pro (which works so well I bought one and now use it myself after my powerlift and Olympic lift sessions).
As to my recovery protocols, I have been experimenting with cold hydrotherapy with extremely good results. It might not be convenient for every kid; some schools have hydro-tubs that can be filled with ice-water and some don't. I happen to own a 100 gallon stock watering tub I bought just for the purpose of longer cold soaks (up to 14 minutes). I do these within a couple of hours of lifting and have found my recovery time between high volume days and high intensity days to be declining over time. I also "cured" a fairly stubborn case of elbow tendonitis that I acquired from trying to adopt a certain type of squat grip (Rippetoe) that was killing me.
Deep hydro-therapy is not for everyone. Mammals have profound instincts that tell us to "get out now" when we jump into cold water. But after the pain of entry, sitting is very peaceful, and after full circulation is restored, my body and mind feel awesome.
FWIW, I think everything that that inures to the benefit of an old-guy lifter like me HAS to be helpful to resilient young pitchers. But I have yet to get my son to jump into that stock tank. Haha!