I know this sounds a lot like layers in AutoCAD, but I would like a toggle (just like the thick lines/thin lines button) that lets me view worksets in color. Every workset would be assigned a color when created, you could change the color but not have two worksets with the same color (I supposed this would limit us to millions of worksets). By default, things would work and look the same as they do now, but you could toggle on Workset colors to quickly scan your model for workset issues, or to identify what workset you should be working on.
For example, I am making pickups on a set of drawings right now, a little change here, a little change there, etc. Every 5 minutes I'm on a different workset, something like this would make it easier to be on the right workset.