We are guilty of having a too-large house, there's two of us in four bedrooms. We could have bought a bigger one (but preferred to get rid of our mortgage) but that's not an excuse.
In mitigation, we both work from home part of the time, so two rooms are offices, but the other is mostly empty other than if we have guests or a lot of washing to dry. In reverse mitigation, since we're in the office part of the week, that means our motherships are wasting light and heat to keep unoccupied desks open for when we do go in, but in reverse reverse mitigation we're cutting down on commuting.
Of course, there's the fact I go swimming, and I've no idea how that works out, that's a lot of water to heat, but equally, given the SHC of water, once it's warm the inputs might be modest but that's another first-world luxury.