Wowzers.
So it's not the people who are in there with a reason to be in there, that you need to worry about. (I'm not saying that Housekeeping never steals stuff, but it's pretty darned obvious if they do, since they know who is cleaning what room) It's the people passing by while the Housekeeper has your door open while working in your neighbor's room that you have to worry about. Someone passing by opportunistically isn't going to go searching. They might see the cords, but they don't know WHERE you've hidden the laptop. It might be in the safe, it might be under the bed, under a pillow, in a drawer, etc. Those people will pass on by and go to a room with stuff out on the desk.
I agree with YOUR instincts, and seriously disagree with your husband and also how he communicated it to you. The nicest thing for him to do would have been to unplug the cords and put the cases elsewhere. That would have been the safest.