I agree that this is a personality quirk more than a side effect of addiction.
I'm natrally a slob. I have to work really hard to keep everythig organized and I'm constantly fighting clutter. I'm 13 months clean and sober. Using made me even worse.
My AH has always been a complete neat freak. He pays attention to every last detail of everything from books to cleanliness. He is the same way sober or using. This trait makes him an excellent liar, and Even better at hiding his stash. He rarely gets caught for mixing up details, and often times closes all of the loopholes. He would leave his things in a specific position to check if I had been snooping. One time, I even put his phone back exactly right and he still caught me. He had wiped all the fingerprints off the screen before he set it down. His DOC is heroin, so in his case at least, his desire to protect his addiction was stronger than the dopey brain fog that opiates cause.