We're not of a tribe that use "Pastor So-and-So" that often, though we do not object to it. I would have thought those who have an antipathy towards "Reverend" would generally feel the same toward "Doctor," but I have observed that is not the case.I've come to think that the proliferation of honorary doctorates is based on a few reasons.
1. The antipathy of calling a man "Pastor" away from his own church. This goes to the Distinctive of the Independence and Autonomy of the Local Church. And the antipathy towards the use of the title "Reverand."
I've never noticed any negative association of "Brother" in our area. We use "Elder," but not many other churches do so. "Brother" is probably our most commonly used term.2. The titles of Brother and Elder seem to be as smacking of Catholicism and Mormonism.