Dave - I have recently bought an 1150gs with ABS, and the EVO servo system. Its all new to me, as all previous bikes I owned, including several BMWs have not had it. Like you, I have not had the ABS cut in in normal ridng, only when I have deliberately provoked it. The general concensus is that its crap, and most people say they can brake better without it. That may be true, under normal conditions, but, when the s*&t has hit the fan, and you NEED to stop very quickly, I defy anyone but the most skillfull of riders to not benifit from it.
I say this with a certain amount of qualification, as I am a Police trained driver, and know a lot of people who also are, and they would agree.
However, as far as off road riding is concerned, it is generally recognised to be better with it turned off, as the system would be cutting in all the time, because of loose surfaces. The MCN article talked about allowing the rear wheel to slide, when you want it to, as opposed to the ABS trying to override the slide, if you see what I mean.
Personally, having had a moment or two over the 25 years of riding I have done, I would rather have it in my back pocket, than not. But, its not the be all and end all though, so don't worry about it too much
Flying Banana