I stayed dry because I happened to stay below the warmth necessary for significant condensation in the sleeping bag, which wasn't rated to the temp that night. And I was under the tarp, so the rain itself wasn't much of an issue, just the wet ground.

I try to avoid single-use things nowadays, so I usually bring a poncho that can be a picnic area, tarp shelter or can be wrapped into a bivy. I also have a bothy bag that can be a wind/rain shelter, or wrap around a hammock.