Sorry IS is a bit of a little bit of a hobby horse of mine. I really don't like it! So it was nice to see an article that confirmed some of my views.
Some find it useful - personally I do not see why. Certainly on a little point and shoot, where you have to hold the camera at arms length, then IS is great. But hand holding the longest lenses that Canon currently make? For me it just gets in the way.
I should say that some lenses balance terribly so IS can be handy, for example it is quite useful on my 100-400 Mk2 at 1/500 sec or less. On the other hand my 800 F5.6 L IS is fine at half the shutter speed and IS shows little benefit at 1/160. Note I have arms like matchsticks so this is not a strength thing.
Given the choice I would have IS removed from my lenses (except the 100-400 Mk2) and enjoy the improved performance.
Life is for living, cameras are to capture it (one day I will learn how!).