A dear old guy called Lofty Marshall at CFS(H) discussed VRS with me and how they used to teach it years ago, until they started filling up skips with helicopters. Do bear in mind, recovering from incipient vortex ring is not a recovery from the real deal.
Like several other exercises (EOLs and Tail Rotor problems included), they may have value, but that value has to be balanced with the training risk and the likelyhood of the actual event.
The actual event of VRS can be avoided through correct handling and awareness.
Don't get me wrong, if you want an annual reminder of the dangers to be demonstrated to you and pusser pays for it then fill your boots. I prefer to discuss it and lay down parameters that will ensure its avoidance.