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You probably are forgetting that for some people, voice-activated systems are not a whimsical novelty, but a necessity -- or at minimum, an important tool -- due to physical limitations. This group includes not only those with limitations on their use of fingers, hands, and arms, but also those who have to limit the amount of time they spend sitting. Voice-activated systems also are a boon to those who have tremors (e.g., those with Parkinson's) or visual difficulties that impede their accuracy in typing or clicking. Many will have used some kind of third-party program or adaptation to make browsers more accessible, but the advantage here is that such programs would not be (as) necessary.
P.S. Please excuse the BIZARRE username -- when it offered the ability to sign in via my Twitter, it didn't tell me that doing so would result in an auto-assigned name I would not be permitted to customize at any point in the process!