I have kept a spreadsheet with a plan for each week for around 20 years now. Now I am retired, I am still trying to break the habit of shopping on a Saturday and going on a Friday morning or some other time when others are at work. Fairer on them and less hassle for me!
So, yes, I do have a plan, but I don't necessarily keep to it.
To balance things out and prevent having the same thing two nights in a row, I have one column on the spreadsheet with the main ingredient and another with the accompaniment (pasta, rice, potatoes..) Because there are different numbers of each, each pairing only repeats about once a month. Mind you, I can never think of much for the pairing "cheese and rice" except risotto with parmesan in it.
But hey ho - our mums used to cook the same thing every day of the week. Mondays it was the leftover roast with chips or mash, Fridays fish., etc.