DW and I have abutting open enrollments. We'd always been coordinating our options, but this time we did something different: she was busy when I wanted to be hashing this out, so she just logged me into her benefits portal and turned me loose.
An accidental discovery came of this: there is a world of difference between the kind of coordination you can do when two people are hashing things out based on their independent knowledge of their plans, and what one person can do when researching both at the same time.
It turns out that we could get her plan down much cheaper than we'd been thinking in previous years. We're kicking her off of my plan, which will free up the COB fees. Those more than pay for her own insurance, which also comes with a $500/yr spending allowance that will more than pay for her out-of-pocket, barring the unforeseen. Keeping the kids on my plan is enough to max out my own HDHP/HSA company contribution benefit, so we aren't missing anything. We're probably also going to move as much life insurance as we can over to her plan because the coverage there seems more efficient, even for me. (I have some more hashing out I need to do with my HR on that point.)
I think next year is going to be about $1.5k better for us than last year, just from optimizing benefit plans.