Depends on your definition of walking distance I suppose but I reckon some areas of Huddersfield you could have to walk a mile or two.
Of course for many people these days walking distance is less than 50m, probably due to their car use: viscious circle!
RE: Lindley - Fair do's then, my experience is limited to the Midlands, South West and South East, never been to Huddersfield.
The rest of your post is spot on, we have a transport network that cannot cope with the demands being placed on it, particularly in urban areas. The cheapest solution is to limit car use, levelling swathes of urban areas is going to be a bit more difficult I would think!