A stairway would probably be preferable to a ladderway in any case. Why crawl or climb when you can run?
An angled turboshaft would be more practical if there are no stops inside the neck; the shaft wouldn't have to feature stations that allow the cab to rotate back to vertical (taking somewhat more room than a standard station) at every deck, then.
Should we consider ST5:TFF sufficient proof that there exists a perfectly vertical and rather wide lift shaft from the secondary hull (from Deck 13 at least) to the level of the saucer (at deck 7/8)?
If so, the feature might just as well have been there in TOS already.