"I figure you don't really need SUL for a short trip."
You figure wrong. I just posted a TR reflecting an overnight adventure with my young daughter. I carried the two person shelter (tarp)and ground sheet, both sleep systems (two 32* quilts, two pads, two bivys), all of the food and all other shared gear (including dog gear). All my daughter carried was her cold weather clothing (down jacket, base layers, beanie and gloves), her doll and two books.
My pack for the trip, a MLD Prophet, weighed just over 10 lbs, complete, with the gear listed above not counting food and water. UL gear works great for such trips with young children.
I take numerous solo, fast and light, overnight trips (two days - one night) covering 80+ miles and yes going UL makes such challenging adventures a joy.
"Do You Actually Use Your Gear?" I do, every chance I get.