Looks like I've taken two steps forward and one back with my husband. (sigh) I asked him what he'd decided after reading the website, and he told me that he'd come to the conclusion that everyone here was basically just saying they didn't like being told what to do - so naturally, he figured, they'd think they shouldn't be told to wait in the car.
Okay, that upsets me. An adult, especially a spouse, should not be telling another adult what to do. I can understand him wanting to just run into a store for a few things, but he should at the very least ask you if it's okay with you to wait in the car. Too bad he can't walk in your shoes...then he'd understand.