@conor78 and everyone else, I have to say that I find all the cues people have said they could do without to be good cues. One can interpret anything in multiple ways, I suppose.
The hip drive of a swing is the same hip drive one uses for a snatch, we just Tame The Arc.
We don't teach, that I'm aware of, "shoulders down and back," just "down" and "packed" and both of those are very valuable cues that have helped many people.
The swing _is_ about projecting power forward and that power comes primarily from the hips.
Lift with your legs - yes, that's what we try to do, with legs and with hips, and not with the back.
Making the spine longer by flexing it is making the back of the spine longer and the front of the spine shorter.
Last but not least, and probably I say should say this first, no cue always works for everyone without further explanation from an instructor.
Really last but not last, not everyone needs to hear every cue, but because a cue isn't good for one person or even a few people doesn't mean it's not a good cue for most people.
-S-