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The purpose of quantum teleportation is the teleportation of quantum information. Teleportation is not necessary to the creation of a secure communication channel.

This is key and why most people don't understand why the name quantum teleportation really is appropriate.

And when you consider the only difference between two particles is the information state they are in. And that you do teleport the information. The name is not misleading.

"nothing disappears from one place and then shows up in another."

This is false. The quantum data is completely destroyed at the entry point and it shows up at the end point.

No, you're thinking about quantum entanglement.