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Considering you still need to know how to use an E6-B to become a certified pilot, I'd like to think they'd know how to use it ;)
Though like I said, the likelihood of a pilot relying on an E6-B these days is pretty minimal, let alone a scaled down version worn on a wrist.
Though in terms of use as a calculator, I'd still say it's more useful than the electronic calculator watches. At least if you don't need ridiculous levels of accuracy.
I very much doubt it, in the same way that I doubt anyone actually uses calculator watches for mathematical operations; I'd imagine pilots derive a small degree of comfort of knowing they've got a potential backup, even if it they don't actually know how to use it...