Then don't use it Mr. Grumpy-Pants.
First off, the name Cortana was actually just an internal testing name, but due to popular demand, Microsoft kept it as the official name. Where does it come from? From the Halo series, it's Master Chief's (the main character) personal AI assistant. So not only is the original Cortana exactly the same concept as Cortana for Windows Phone, but it's also very well known and popular. Because of that, Microsoft can get a lot of free press by using that name, and easily captivate the attention of the gamer community.
Second off: yes, people don't use Siri. Why? Because it's not practical for day-to-day use, it actually quite sucks. Despite being practically synonymous with "digital assistant" these days, Google Now is often considered far better and way more practical in daily usage could dream of being. But people do cite Google Now's lack of personality, and how there aren't any privacy settings or controls.
This is where Cortana is trying to differentiate herself, by offering the best of both worlds. She'll have the personality and sass of Siri, yet the usefulness of Google Now. But in addition to that, Cortana will also supposedly offer better natural-language recognition, so users won't have to conform to commands, just to use Cortana. She also differs from Google Now in that she offers a notebook. That way, if Cortana gets any of the information on you wrong, you can correct it. Or, if you're a privacy buff: you can use the Notebook to chose what information Cortana is and isn't allowed to look at. So if you say she isn't allowed to look at something, she won't use that as she tries to learn about you.
But most intriguing for people like me, is that Cortana WON'T require you to speak to her. First off, you can use all of her commands via text. Just type in the exact same things you would otherwise say to her, and she'll treat them as normal (and she'll respect the fact that you didn't speak to her, so she won't give a spoken response). But in addition to being able to being able to type in commands (useful for loud areas where she wouldn't be able to hear, in a quiet library, and/or if you're like me and find the idea of talking to your phone awkward): Cortana is weaved throughout the OS. She'll start conversations with you.
For example: if you're texting someone about getting dinner at 8:00pm, Cortana may turn it into a link (similar to how addresses and phone numbers already work). Tap on the link, and a calendar appoint will pop-up with some of the info already filled in. Were you talking about a particular place? That'll already be filled in for you. Time? Check. Invites? Done-and-done.
For me, that's to coolest thing. Whereas Siri and Google Now are completely passive, requiring to user to start conversations with them, Cortana takes a more active role, and will approach you to make your life easier. Once Cortana learns where you work and figures out your daily commute (if you let her, of course. You can always disable what she is and isn't allowed to do), she'll tell you if there's traffic. Google Now would require you ask it if there's traffic, and Siri doesn't even provide traffic information.
But with Cortana, if she detects traffic, she'll send you a notification alerting you there may be a delay, and advise you to leave early and/or offer detours. I think this is incredible, and has me genuinely excited to see it in action.
Granted, there's a huge gap between what Microsoft's vision for what Cortana will do vs. what it can do, and how well it actually pulls it off. But should Cortana live up to hype, then ladies and gentlemen: we've got a winner.
Still not interested? That's fine, then just disable Cortana, and continue to use Bing search as per normal.
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