Donald Sensing refers to "the new erotic-worship genre" (not his term) and links to some Christians who feel that many modern worship songs are focused on the supposed-worshipper instead of on God. Rather than quote his quotes of other people quoting various articles, just follow the first link; I'll wait.
This is the air I breathe, this is the air I breatheI happen to like the song, and I don't think it's particularly "erotic" (perhaps the writers were projecting their own emotions?). Both metaphors -- God's word as bread the Holy Spirit as the breath of life -- are directly from the Bible. As for emotion, compare it with the longing expressed in the Book of Psalms.
Your holy presence living in me
This is my daily bread, this is my daily bread
Your every word spoken to me
And I--------, I'm desperate for You
And I--------, I'm lost without You
Psalm 5And so on. I could go through the entire book and find dozens more.
1 Give ear to my words, O LORD,
consider my sighing.
2 Listen to my cry for help,
my King and my God,
for to you I pray.
3 In the morning, O LORD, you hear my voice;
in the morning I lay my requests before you
and wait in expectation.
As for eroticism, just go read Song of Solomon, which describes the relationship between God/Christ and his chosen people (Israel, and arguably, to some extent, modern Christians as well) using the metaphor of marriage.
Anyway, I agree that worship music is about God, not about us. In reality, singing is only one way to worship God, and not even the most important way. Perhaps one of the biggest failings of modern Christianity is mistaking mere singing for worship, of which it is only a part. More importantly, we should worship and honor God in everything we do, and in every aspect of lives. (Including the erotic.)