With most, I am content with doing 1 layout, but there are some kits that I find myself returning to over and over, whether for papers, elements, or alphas. Now that I'm "mostly" organized with ACDSee, I find that I don't usually use "only" one kit in a LO, whereas before I was kida forced to stay within one (due to not knowing where to find anything!
).
But I probably haven't used about 90% of what I have.
Even digitally, I'm a packrat.