I think Voyager is not just a space exploration project, but more a demonstration of technical ingenuity. Sure, the probe probably collected great data just by being where no other probe was before, but to be real: I don't know nearly enough about space exploration research to get excited about the results and mostly just looked at the pictures.

What amazes me about the device and the mission as a whole is the sheer challenge of operating a device that is so far away, you have to use the prefix light to make the scale understandable. I like devices, that have been engineered to something close to perfection. I think aircraft a cool because they so very rarely fail. I think that pacemakers are amazing, because they can not fail. This is another example, and perhaps one of the greatest: a spacecraft that is running for 40+ years in the harshest environments and still works.

And that's not even touching the emotional and somewhat existential thoughts that comes with the scale and distance this little guy has traveled.