An interesting article, and I certainly agree gaming can be a useful "complimentary treatment" to pain and psychological problems, perhaps on par with massage and other similar things.
I know when I was in secondary school, games where a good way to take my mind off of the loneliness I felt being the fatter, nerdier one who actually liked to learn things (a cardinal sin in British schools these days), and doesn't like alocohol (another sin in England in general these days).
Games keep me sane, and I have noticed that their is an effect of distraction when under the weather (i.e. colds seem to bug me less, flu felt less strong, etc). It should be noted that game addiction is a factor to watch for, but as you said, compared to drug-addictions, its not on the same scale at all.