A "mere" 40 light years seems so close, and yet without a warp drive, not even generation travel would realistically get you there. We need a warp drive.
Of course, if we could efficienty reach to 55 Cancri e, it would sure kill today's diamond industry!
Still, when I heard that in the news last night, I was duly fascinated. Only so few years ago, many people were still doubting the existence of any other planets existing in the universe, outside of the Solar System. If that can be believed (then or now).