It does take a little while to retrain, but I think it's worth it. There are some additional benefits aside from those already mentioned. It saves the step of switching between MF and AF mode on lenses for certain shooting when you want to manually focus. Also, if you have a subject which moves quite quickly in one spot, then it is invaluable. An example froma few years ago, before my swithover, was when an adult starling was feeding a recently fledged youngster. Every time the feed happened, using normal AF, the camera immediately focused on the grass behind, which was a bit of a pain to say the least.
It isn't so much a case of switching back button focus on, but more of switching the normal AF off, as the default is to be able to focus from the back button or the shutter, instead of just the back button.