Missfoodlove I could have written your post. I love food, love exploring new ingredients and new recipes. Today we are having a Nigel Slater recipe for chicken and leeks from The Observer a week or so ago, and we had an Indian style potato recipe on Sunday.
I decide on the plan on Tuesday, go to the market on Wednesday, then adjust the menu based on what I could or could not get there, then Waitrose on Thursday.
Like most people I have a freezer so the menu can be adjusted if need be.
I have done meal plans since I left home to live in a bedsit in London in 1965. Saturday morning I would trundle down to the market (in, I think, Prince of Wales Road on the borders of Chalk Farm and Kentish Town), buy all the fresh food I wanted, and then the supermarket on my way home on Monday evening.
You just plan, buy and forget until it is time to cook. Time saving.