I don't use a meal plan, but I do provide parents with a list of our usual meals and snacks that we rotate through. I tried a monthly meal plan when I first started and didn't like it....I like to be able to buy what is on sale and also will a lot of times double up on my family's supper so I can serve the leftovers for daycare lunches. The parents I work with don't want or expect a meal plan, though I know there are parents that do.
If it is a good week I will plan ahead my lunches for the next week so I can get the groceries on the weekend. Snacks are usually just whatever is on hand/on sale.
The biggest problem I have is trying to get supper ready for my family before I'm done work, as I often have daycare kids until 6:00pm and my own kids have activities in the evenings. Hate that evening rush!!