I did consider the Sheet Set Manager but I didn't see a way to convert the layout tabs to a sheet set (granted, I didn't look all that hard at doing converting them). We usually don't have that many layouts in our drawings and we have never had a need to use the Sheet Set Manager either. A lot of our drawings are diagrammatic and are drawn in Modelspace - no need to set up paperspace and viewports on them. But we also have structural and piping drawings that seldom need more than one layout tab and rarely more than 3.
In this case, we inherited the drawings from someone else and we're kind of stuck with the way they are set up.
I was getting irritated with having to scroll through 42 layout tabs. Luckily, there's been a lot of great solutions out here that have made my life a bit easier.