We have full routines for gold standard, 4 or 6 walls in each dance. Also have some small floor and large floor alterations. I feel sticking to a routine allows us to look and feel better rehearsed, and dance with greater confidence. We know and practice lead and follow, but through adjustments of direction and step size for floor craft, I don't have to deviate all that often unless the floor is really crowded. At times when I absolutely have to go off script, I tend to stick with more basic (bronzish) figures until I can get back to some part of my regular routine. Personally, I don't want to think about which step or which grouping I'm going to lead next. If I know the whole thing by heart, it's one less thing I have to worry about on the floor, and I can concentrate on more important things, like wiping the glazed look off my face and smiling.