Ya know, I never really thought about it like that. But it could really save you a lot of time in the long run, to just order like that, when out for a bite or drink. No tapping/scrolling through some slog of a tablet menu (wich also annoys you by trying to push more crap onto your order, or nagging to donate/tip. Screw that shiz!), or having to explain your order to the person behind the counter. Just a quick and effective 'I'll have what he's having'.
Also a good reminder to still try and keep a bit of cash on you most of the times. Cause there can always be some machine/power/internet issues with all of that so called more 'convenient' and 'safe' digital money.