Yes, planning can make cooking and everyday life so much easier. Make it a fun time, a relaxing time when you can just set aside a little bit of time and think through some menus that utilize some of the same ingredients and you can be on your road to easy meal preparation. Some days (or nights) you may need to prepare a little more but then you will have it ready for the next night or so as a totally new interesting dish instead of just "leftovers".
You remember the fish tacos I prepared about a week ago, well, since I am only cooking for the two of us, I had enough leftovers to take that dish to work for lunch later in the week. One of the leftover ingredients from the fish tacos was the tortilla. I don't like to overeat, but I hate worse to waste food, so I try to think of ways to use ingredients that will spoil in a different preparation. Last night I decided I would do several things. First, I would use the tortillas and make homemade tortilla chips to go with my tortilla soup and I would also cook extra chicken and have it ready for another dish which is Asian inspired with cellophane noodles.