Why do they still stick needles in us?

Isn’t it a little barbaric and old fashioned? I mean, aren’t we in an enlightened age? We can put a man on the moon (well, they said we did) and we can’t figure out a better way to get vaccines and medicines in than to take a long, sharp, nasty needle and jab it into our skin about a foot deep. Well, not a foot, but it might as well be.