The mercedes cruise set, increment, decrement also doesn't seem intuitive to me. The old GM style cruise control stock is more intuitive and less confusing. It's probably because that is the system I first had. Personally I don't like the steering wheel cruise control systems at all.
What king of design does the "GM style CC" have? I have difficulties thinking of a more intuitive approach than the MB CC stalk.
I'm sure I have used the wrong stalk a couple of times but I cannot remember if it was more like using the blinker when the intention was to hit the CC lever.
But I cannot see the danger involved with using the CC stalk when the intention is to use the turn signal. If you put the turn signal on well in advance (like explained in the school), either CC is already on or you are anyway still about to start braking.
And if you put the blinker on only some time when turning, the speed would not increase but stay constant, I don't think anyone activates "resume" accidentally when trying to use the turn signal.
I guess I'm more used to the MB design although I don't think the first car for me with CC was an MB but I never liked those cars that had the CC buttons at the steering wheel (usually then with a separate additional activation button), I never find any reason to look at the stalk when operating CC on an MB but with other cars it does not work (perhaps a lot of experience helps).
I tried a new VW recently, when I activated CC first at low speed and later activated it again at a higher speed, it always picked up the previous lower speed (it works from the stalk but I don't remember any details). During the trip I did not learn how to use it smoothly.