"Shut up and let me pray!"
The problem with Catholic liturgy is not about languages or what Missal is being used. The problem is if people care or not. If you care, you will understand a psalm verse either if "the loving kindness of the Lord endures forever" is read, or if "quoniam in aeternum misericordia eius" is chanted in Latin and you follow along in a missal. The "shut up and let me pray" attitude can be present in both cases, and neither is really liturgy. That is not to say that this attitude is not a healthy one. Sometimes we just need to talk to God in the midst of the throng, and I do it all the time in church. But liturgy has very little to do with it.
Liturgy is the act of praying and being with the Church in space and above time. It is an impossible task, since we are not angels and we contemplate God through our senses. So real liturgy in a lot of ways is the knowledge of our own failure to worship, either through carelessness or pharisaical rigidity. It is an act of self-abasement before the mystery of the Incarnation: the encounter between God and man. And on this side of the Wedding Feast of the Lamb, it will always fall short.