Meal Planning - yay or nay?

I prep smoothie bags for breakfast on the weekends and add unflavored protein powder (morning work outs then work), and I pick 3 meals from a healthy cook book (only cooking for one) and cook about 3 times a week. The meals spread out and are pre-portioned for dinner than night, lunch and dinner the next day, and lunch the following usually. I'm fairly busy, so cooking a few times is a lot easier and fresher than cooking every night for me.

I have done meal prep, 15 meals, all in one day, but it's very hard without help because it takes so long.

I take about 2 hours on Sunday, and make my lunch and snacks for the week to take to work.

I usually have:
Greek yogurt, with nuts and a fruit for breakfast.
Salad with a protein for lunch.
Snacks--carrot sticks, mozzarella cheese sticks, grape tomatoes, nuts, etc.

I just like to have it ready. If I don't have my lunch and snacks with me, I will wind up eating 750 calories in a sandwich or 400 calories in a bag of Doritos. (It is quick and available.)

I did hang a month long dinner menu on my fridge, but that is because the minute I walk in the house from work I hear, "what's for dinner." The dinner menu let's me buy everything on the weekend, and then I can just cook it when I get home.