RE #9: I basically agree with that link (and I had also looked at it before posting the link that I did),
What's interesting is that I could very well imagine that after beginning an address with "Dean XXXY," a speaker who is indeed on a close, first-name basis could indeed address the Dean as "First Name" when speaking to the dean directly (for some reason) in the speech (but in spite of that would less likely do so when speaking about the Dean in the rest of the speech).
Of course, the use of various titles all depends on the culture of the institution at which it is taking place. At the University of Chicago, for example, the use of "Professor" and "Dr." may be avoided in the classroom. Instead, students address the prof as "Mr. XYXX/Ms. XXXY." (and the profs may address the students in the same manner). Other graduate schools in the neighborhood, independent of the UofC, follow this practice, although in those institutions, the students, faculty, and staff are on a first-name basis from the start. We even called the president of the school "Bill" and the dean of students "Jean."
The stated logic of the practice was that it was assumed that the faculty had their doctorates (at least those who taught at the graduate level) and that they were professors, so the use of titles wasn't necessary. When I think back on it, though, I never took a class at the UofC, so I'm not exactly sure if they actually followed that practice there. (I could have have taken classes there, but the tuition per class was about four times that which was paid at the other graduate institutions in the association.) However, the three or so other graduate institutions in the association at which I took classes followed the same practice as my institution.