I've used the double buggy once, to take both kids to the dentist. Every other time E is in the sling and T the buggy. It's kind of handy having it as an option, but I can't see us using it much. Still, the buggy we have is a funky one that does single or double, so I'm still using it, just not as I intended.
We've got a bit more drama here. E has blood in her pee, so I've been doing daily pee samples and walks to the dr. T has had much more tv as a result. DH isn't happy, but he doesn't have to deal with everything. How much tv do your DC watch? Just wondering if DH is a bit over the top at wanting none at all unless it's him getting a break because of it, though still blaming me for allowing him.