What's that infamous keybind I've heard rumors about that will change my teleport experience entirely?

/bind lshift+lbutton "powexec_name Teleport"

Oookayy. What does it do exactly?

Hold down your qualifier key for Teleport (left shift in this case) and just left-click with your mouse at the spot you want to go. This makes Teleporting around as easy as point and click as it gets rid of the additional targeting with the ground target cursor after activating your teleport power.