As I opened your post, I thought "I wonder what he will say? Surely there is no real use for rope in his flat, lake-infested wilderness..." Just shows how versatile rope can be.
As this photo by eminent Minnesota photographer Craig Blacklock illustrates, Minnesota is not exactly tabletop flat. That said, you are correct in assuming that I know nothing about technical climbing or any of the ropes or gear associated with it.
Primary uses for rope in Minnesota:
-Tying inner tubes together to float down a river with a beer cooler
-Tying dogs together to pull the sled to the tradin' post
-Rope swings over the lake
-Hanging vittles in the trees so bears, coons, and bigfoot can't get 'em
-Pulling stuck smowmobiles out of the snowbank
-Tying up the Lund for a quick break on shore
-Strapping an 8 pointer to the top of the SUV.
There's probably other uses, but I can't think of any.