Wow, the difference between Shiprock and Gallup vs Columbus is like night and day.
Shiprock is extremely rural, with a high level of poor residents and I would imagine a fairly small health care system. That said, I think it could be a very rewarding place to work.
Columbus, by contrast, is the home of some very large hospitals that draw patients from other states for care. There are also very specialized hospitals here, CA, MI, Trauma, etc.
As far as Dublin goes, it's far more developed than you probably remember, on both sides of the river. More restaurants, grocery stores, shopping, new schools etc.
I hope this helps a bit, feel free to PM me, I'm starting my own job search in Columbus so I may be of some assistance.