Now, it could well be assumed that there is a central turboshaft in Kirk's ship, right at ship centerline, climbing all the way to the bridge. And then there's a little side branch that ends at the door... Perfect for the "taxi rank" system where multiple cabs are waiting, and one pulls to the doors whenever somebody needs a ride down while another remains waiting.
This is exactly what I believe. I could never accept the "35 degree offset" bridge explanation. It just seems a poorly contrived theory of why the turbo shaft as seen from the outside of the ship sits at the rear of the bridge, while the internal doors are offset from the rear. I always envisioned a "staging area" where at least one extra turbolift waits in place for someone to enter from the bridge. It also slides off to the side when another lift arrives.