Aft Helms pros
1. best position for pleasant weather sailing (you can see the sails from the helm)
2. get to choose windward or leeward helming depending on conditions (this deals with alot of the exposure issues I think)
3. ease of docking (as others point out only if throttle levers on both helms)
4. extra room in cockpit from no helm over or within cockpit area
5. lower boom/ more sail area for mast
6. Redundancy (if properly rigged with cable steering to both rudders from both helms)
Aft helm cons
1. potential to have to helm in a more exposed position in rough weather if auto fails
2. sun exposure from no bimini
For me the pros outweigh the cons. ill just make sure i have spare auto parts
If i had to helm for 17 days straight then the raised midship helm would get the nod no doubt but lets face it no helm would be anything more than just bearable in that scenario. The real issue is rendundancy on autopilot not helm position.
Personally I hated the movement of the shorter (40 feet or less) raised helms in seas (someone described it as riding an elephant recently i think - sounds about right)
For me at least unless im out day sailing
the auto is often on even if im just sitting at the helm with a cold one. For cruising its always on if conditions allow. When i want to enjoy my sailing then the aft helm is the pick just as with monos.
I think the Nautitech is a pretty poor example of aft helms - they are further back than most and the stem is shorter amplifying this. Agree the throttle levers are just stupid where they are mounted on the other post!