It would be interesting to see what practices were dropped in response to the Reformation.
Here’s a good summary:
“While the traditional fundamentals of the Church were reaffirmed, there were noticeable changes to answer complaints that the Counter-Reformers were, tacitly, willing to admit were legitimate. Among the conditions to be corrected by Catholic reformers was the growing divide between the clerics and the laity; many members of the clergy in the rural parishes, after all, had been poorly educated. Often, these rural priests did not know Latin and lacked opportunities for proper theological training (addressing the education of priests had been a fundamental focus of the humanist reformers in the past). Parish priests were to be better educated in matters of theology and apologetics, while Papal authorities sought to educate the faithful about the meaning, nature and value of art and liturgy, particularly in monastic churches (Protestants had criticised them as “distracting”). Notebooks and handbooks became more common, describing how to be good priests and confessors.
Thus, the Council of Trent attempted to improve the discipline and administration of the Church. The worldly excesses of the secular Renaissance Church, epitomized by the era of Alexander VI (1492–1503), intensified during the Reformation under Pope Leo X (1513–1522), whose campaign to raise funds in the German states to rebuild St. Peter’s Basilica by supporting use of indulgences served as a key impetus for Martin Luther’s 95 Theses. The Catholic Church responded to these problems by a vigorous campaign of reform, inspired by earlier Catholic reform movements that predated the Council of Constance (1414–1417): humanism, devotionalism, legalism and the observantine tradition.
The Council, by virtue of its actions, repudiated the pluralism of the secular Renaissance which had previously plagued the Church: the organization of religious institutions was tightened, discipline was improved, and the parish was emphasized. The appointment of Bishops for political reasons was no longer tolerated. In the past, the large landholdings forced many bishops to be “absent bishops” who at times were property managers trained in administration. Thus, the Council of Trent combated “absenteeism,” which was the practice of bishops living in Rome or on landed estates rather than in their dioceses. The Council of Trent also gave bishops greater power to supervise all aspects of religious life. Zealous prelates, such as Milan’s Archbishop Carlo Borromeo (1538–1584), later canonized as a saint, set an example by visiting the remotest parishes and instilling high standards.”
http://en.wikipedia.org/wiki/Counter-Reformation