Been there, done that

Psalm 114:3-4 - The sea looked and fled,
the Jordan turned back;

the mountains skipped like rams,
the hills like lambs.

Israel's crossing of the Red Sea is mentioned many times in the Bible. I wonder why their crossing of the Jordan -- also a miracle -- is not spoken of as much. Is it the "been there, done that" syndrome? True, there was no army drowned in the Jordan, but it was still quite a show.

I wonder if the skipping mountains and hills refers to the probable volcanic activity at Mt. Sinai. Are there two separate instances of skipping referred to here -- one for the rams and another for the lambs?