Why the repetition and exactness in prayer and religion?

In religion, we are often taught to pray using certain physical positions and prayer language. 

Perhaps the some of the importance lies less in exactly the way we are speaking and forming our bodies and more that it is the same each time and that it is set apart for prayers. 

In this way, we signal to ourselves and others (in group prayers) that we are in the mode of praying.  Perhaps our ears hearing that language set apart and our bodies in the familiar position, get into the prayer mode more quickly and deeply. 

It is said that our ideas of worship and prayer come from Protestant culture.  This is what was going on, or the culture when the Church of Jesus Christ of Latter-day Saints was restored.  Perhaps if the church was restored somewhere else in another time, the prayer position and language might be different.

This idea is helpful when working with other languages and cultures.  Is is the consistency and set-apart nature that is more important than the actual wording or position?

And will this help when for example someone is unable to get out of bed and kneel?  Could they create their own set-apartness?

 In the Latter-day Saint temple, there are ordinances which must be said exactly.  However, the words in the ordinances have changed a number of times over the years that I have been doing ordinances in the temple.  Does this mean we have to go back and redo every ordinance done before the changes with the new changes?  I have not heard of that happening.  If not, what does that mean about why the words must be exact? 

 Knowing what to expect and doing something apart both in word and in action helps to put us in the proper frame of mind to experience the Divine and to receive revelation.