In the past, Rorate has had occasion to quote a true and faithful son of St. Benedict, Dom Mark Kirby, O.S.B., Prior of Our Lady of the Cenacle Monastery (a.k.a. Silverstream Priory) and author of the admirable Vultus Christi blog. We all know about the sufferings that versus populum worship have inflicted on the faithful who are simply hungry for worship in spirit and in truth and who long for a manner of celebrating the Mass that is focused absolutely on Christ our God (as the 2,000-year tradition of ad orientem worship palpably demonstrates), but we do not perhaps reflect as much on the ravages that the versus populum stance have visited upon the clergy.
Here are some excerpts from a recent post of Dom Mark's, "Lex orandi, lex credendi: the ground of priestly piety". (In the article you will also find highly pertinent texts from Pope Pius XII's Mediator Dei that back up these points.)