A lot of this comes down to different aesthetic preferences about things. There probably SHOULD be a point where people sing a wordless song together, either at the Solstice or another event. (Actually, I may have just solve a problem for next year's Solstice. Stay tuned. For, like, a year, because I think I want to keep it secret except for a few confederates. :P)

One of the most potent experiences I got at Burning Man was going to a steam bath, wherein someone spontaneously started humming a wordless melody, which people gradually joined in on. It definitely had a lot of power to it (amplified by the intense heat and what-not).

But I think there is plenty of reverence to be found in lyrical songs. Most people reported than their greatest sense of reverence was felt during the song "God Wrote the World", a song about scientific discovery and seeking truth written in the observable world. (while invoking "God", it's pretty metaphorical. The song was written by an atheist in semi-theistic terms to be approachable to fundamentalists.)

(This song does, in fact, contain a factual error. Immediately afterwards there was a pop quiz to guess what it was. One person got it)