I've not read the whole thread.
I did FLYlady about 18 months ago now, I have never been able to get back into it again. I have always lived in a state of chaos, and never have anyone over as a result.
Those few months where I was on top of everything were incredible. I wasn't ashamed of the state of my house. I felt calmer, I felt happier.
Some people are born to make a cup of coffee, wipe off any spillages, wash the spoon/put it in bowl/dishwasher, drink coffee, put the cup in bowl/wash it/dishwasher.
Other people are born to make coffee, spill water, milk and coffee across work surface, wander off and drink coffee, put half drunk cup on mantle in lounge, go out for the day.
There are obviously tweeners, but those are the extremes. If you are one of the second by nature, and then marry a matching one, you will live a life of mess.
It doesn't come naturally to you to sort it, you MN/read books/go out/have a bath - anything than sort it.
FLYlady slowly seeps in and kicks you into doing it as you go. It is always a conscious effort, but it is a hell of a lot better than the life before.