My view on liturgy is based on my experience as a parent - and pondering about how the insights gained from my kids interacting with me might relate to how we interact with our Heavenly Father. Liturgy is essentially repeating the same thing over and over and over again on different days. Now what if my kids used this in communicating with me? The first time it would be cute and amusing. The second would be puzzling. The third would start to give me some concern. After the n-th time, I would be looking for a good psychiatrist. In fact, if my children responded with some liturgical forms every time I wanted to talk to them, I would probably think that they didn't really want to communicate with me.
That isn't to say that our communications are entirely without liturgy. For example, we hear often things like "Mommy, Daddy, I'm home!". The pattern doesn't change much from one time to another. The Bible did give us the Lord's prayer as a pattern, but should we endlessly repeat it? Or was this simply a list of some of the things that our Father likes to talk about?