i carry (gasp!) about 30 feet of extra 550 cord cuz it's so flexible for different needs. it gets wet in the NW, it gets used as a clothesline often enough to justify the weight, and i can set up different storm pitches too. definitely worth it for my system.
i also generally have a group with at least one new recruit, and paracord makes comes in handy for that too. adjusting quilts and tarps, tying things outside of backpacks and whatever.