No again, I think Sith just use the Force for completely different purposes. If stuff like lightning and choking is just for destroying people, I am quite sure the Jedi wouldn't use it. Just like pacifists will not use guns... doesn't mean a pacifist can't FIRE a gun. They just don't use it.
I think that is the case with these powers. Luke uses choke, but then he's hardly a fully trained Jedi... maybe he doesn't have that clear distinction yet. And what Palpy may also mean with that lightning is that he is much stronger than half-trained-Luke... He subdued Anakin, and now he destroys the Jedi's last hope. That's the full power of the Dark Side he suggests, that the Dark Side overcomes all... But he was a little wrong there.