Some prayers are simply good and well-trod paths that we can use as the scaffold for our own prayers. Used properly, they do not inhibit real conversation with God just as the well-known learned and taught patterns of conversation do not inhibit free and spontaneous discussion. It's all in how you use these forms, making them your own by conscious attention on their object, or a rigid and lifeless form to simply get through.
This is one prayer I like for its encouragement to love God with all your heart, soul, and mind:
God Be In My Head
God be in my head and in my understanding.
God be in my eyes and in my looking.
God be in my mouth and in my speaking.
God be in my heart and in my thinking.
God be at my end and my departing.
(Reprinted in Peter Kreeft's Prayer: The Great Conversation)