I am actually rather thankful for this, as I don't really see G-d as a father figure and never really have. King, Master or Creator works better for me, because it reveals G-d's Majesty.
Perhaps that's what @izzy88 was getting at, not so much that this concept was absent from Jewish thought prior to Jesus (evidently it was employed) but rather that he - for some reason - emphasised the "fatherhood" of God to a very pronounced degree, over every other appellation.
The Pater Noster (Our Father) is a case in point - it's very similar to other Jewish prayers but the sheer frequency of Jesus's references to the paternal nature of God in his preaching is, perhaps, uncommon.
The prominence of this idea appears to be derived from Jesus's own perceived relationship with the Father, as in this synoptic prayer:
Matthew 11:25–27 NRSV - At that time Jesus… | Biblia
25 At that time Jesus said, “I thank you, Father, Lord of heaven and earth, because you have hidden these things from the wise and the intelligent and have revealed them to infants; j 27 All things have been handed over to me by my Father; and no one knows the Son except the Father, and no one knows the Father except the Son and anyone to whom the Son chooses to reveal him.
The later Gospel of John is basically an extended exposition on this "relationship" between the Son and the Father.