Me, too. Except I still am surprised at what I find.
Bathrooms that have not been well cleaned in a long time always gross me out. The thick coating of dust, hairs, spider webs and whatever else is truly yucky. It isnt hard to clean, but still.....I know some people dont SEE this sort of thing, maybe because they dont see things as a pro cleaner does.
And kitchens, too, that have not been well cleaned. Dirty dishes all over the place, trash, crumbs, spills, etc. It is amazing that these people stay alive in such a mess!
Like you, I go to it, and get it all done, and the entire time I am trying to plan ahead on how to do it better next time.