The idea of doctrine is unusual as a feature of scholarly attention. The only two spheres of academic learning that I can think of which rely on the idea of doctrine are law and theology. One might even say that doctrine is crucial for these two areas of learning, and anathema for most others.
Legal doctrine is studied extensively by law students, and times were that "doctrinal" scholarship was the primary preoccupation of law professors. That changed to some extent with the coming of both the crits and the 'law and...' phases of legal scholarship, though there continue to be accomplished and interesting doctrinalists (indeed, I have noticed a new wave of young-turk doctrinalists lately -- in some ways, it is they who are today's subversives). But even those who plow the interdisciplinary and critical fields know to pay doctrine its due; stray too far from it and one's writing begins not to look like legal scholarship at all. It may even be that it is doctrine which puts the 'legal' in legal scholarship. I am far less familiar with the history of theology as a discipline, but it seems to me that the interpretation of doctrine would play a central role in the life of the theological scholar. The accretion of exegetical incrustations is a happy and welcome event for theology, a sign that the field is thriving, and when one becomes a theologian, my guess is that one is committing oneself to the idea of doctrine as a core feature of one's writing life -- even if it is one's aim to offer reforming, novel, or radical doctrinal interpretations.
Is there any other discipline in which the idea of doctrine is accorded respect, let alone pride of place? Does it make any sense to speak to a philosopher or a literary critic, a scientist or an architect or a mathematician, about doctrine? In these fields and most others, doctrine, to the extent that it appears as an intellectual phenomenon at all, is an impediment. It is an obstacle to be blasted through, something to be challenged and replaced. Parricide is the order of the day, and if there are doctrines out there, they are regarded with executioner's eyes by the next scholarly generation. Naturally there are dogmas in all fields, law very much included, but the idea of dogma is different than the idea of doctrine. A dogma is an entrenched but temporary piety; a doctrine has greater permanence and less attitude. A doctrine is regarded by those within the discipline as fundamental, a cornerstone on which sound buildings can be constructed, redesigned, and reconstructed. A dogma is more militant, more ambitious, and more brittle.
What can explain the prominence of doctrine in law and theology? This is too large a topic for a blog post, but some rank speculation follows after the jump (which I hope readers will supplement).