I created another account, standard user, and saw no difference. I deleted it including the home directory.
When I first got this macbook, I got everything working then read about creating another account as admin, and demoting myself to standard, and that's how things stand now. So I can log into the admin account or else put in the admin login to change certain things. The only issue I've had since changing from admin to standard is that now parallels shows red in the Activity Monitor and indicates "not responding" when, in fact, it is working OK except for being red and saying "not responding".
In any case, the admin account, and the test account I created for your test, do not indicate that they have library files in their home folders. Perhaps they are hidden, I don't know enough to check. Consequently I couldn't find another "Dock" directory with associated files. They must have existed, because the desktop backgrounds reverted to default.
So, I can't report any further progress, except to say it doesn't seem to be unique to my account.