I think semantics are more important than what most people realize. Often during a conversation where a disagreement is taking place, one party will intend to deflate the others argument by essentially saying 'That concept is not important because it is only about word usage.' It is true that on many occasions semantics can get in the way of having a meaningful conversation. It should be noted however that semantics can also be used to completely change the way we think and react to the subject being discussed.
The following web log highlights an interesting point in regards to the New Translation: A Semantic Proposition
I think it is worthwhile to think about how semantics effect the Liturgy of the Mass.