This too. I have a silly keyboard at work with a row of extra buttons at the top, of which the only ones I use are the volume knob and the one that summons the calculator.
Probably not as much as the 'Switch F keys to alternate function mode' key annoys me on one of mine, because that's the point where half the functionality of the keyboard wanders off and hides round a corner until I notice what happened. Not to mention that the alternate keys often do strange things.
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Now I do Win+R, "calc".
(Or, more likely, "c" + retrieve from drop-down of LRU programs.)