Been thinking about this some more. This sure depends on what your meaning is.
Does doing so serve any beneficial purpose or does it lead to a segregation based on title rather than on Jesus based lives?
One possible meaning (that of addressing a believer one way and non believers another):
As far as beneficial purpose, I do change many things if I am aware about the spiritual state of someone I am addressing. Regarding each other as brother or sister can help reinforce to myself how I relate to them. If they are a fellow believer, I have something in common that provides the nucleolus of our fellowship. If I am unaware of their spiritual state, I try to be a positive example and let them see Him thru my comportment. That way I may be a blessing, whatever their position in Christ.
As far as segregation, I do think that it is not a bad thing to reinforce the relationship with other Christians, and although friendship with the unsaved is still a good thing that should be encouraged, the relationship and our responsibilities under the Lord are different.
Acknowledging this
distinction (which is a word I would rather use than
segregation) is not meant to be a judgmental or negative thing.
Another possible meaning (whether its use these terms among believers is beneficial)
If your post is whether to use the honorific term (brother, sister, pastor, reverend, etc)
whenever we address one another, I would fall back on simple courtesy, the formality of the occasion, and the common practice of the group. There are some congregations that use them whenever they speak of or to one another, there are some that do so in group announcements but revert to first name (or Mr -- if they do not feel on first name basis) when they speak individually.
As for the use of terms related to church office (pastor, deacon, etc.), I do feel that in groups, the honorific of that office is common courtesy when others are present. When I was working and addressing my supervisor, I would use
sir or Mr/Mrs Jones, while in private most preferred that I use their given name. This is not subservience in the sense of being of less value, but an acknowledgement of their leadership position.