+1 for freezing, snacks, and smoothies. (Haven't tried a slow cooker, but that seems like a great idea, too. My friend just told me today that she has one that cooks and then has a "warm" setting, so you don't have to try to predict the precise moment when you'll get home.)
I travel (fly) for work, and I work in the ER, where the hours are weird and breaks for eating do not exist. So if I can do this, anybody can! :-)
When I'm home, I start every single day with a green smoothie or juice. It's a fast, easy way to get a ton of nutrition into your body, and the juice can even be made the night before if you prefer.
As far as snacks go, I tend to do better, especially on busy days, if I have several things I can grab and eat quickly when I have two seconds. I take energy bites (recipes all over the internet, but basically nuts, dates, and a few other things -- could be oats, another fruit, spices, etc. tossed in the food processor and rolled into balls -- last days at room temp and just about forever in the freezer), fruit, green juice, carrot sticks, etc. to work and grab some every couple of hours. And I completely agree with the person who said that a snack (appetizer?) is a great idea if you're starving when you get home at 5pm and aren't motivated to cook because you're too hungry.
My freezer is constantly packed, and I never eat the same thing over and over until I'm sick of it. Each time I make a meal, I put the leftovers (usually 2-4 servings) in the freezer, so I always have 5-6 different things to choose from. To save space, you might consider just making some sauces and freezing them. Then you can add pasta and maybe some veggies later. I have pesto, marinara sauce, butternut squash "cheese" sauce (I follow a plant-based diet, so no real cheese), and a miso-curry sauce, all homemade, in my freezer right now. So between the complete meals and the sauces, right at this moment, I have a choice of about 10 things with almost no effort!
Oh, another quick and easy meal that I use fairy often is a bowl with a grain, a green, a bean, a sauce, and one other thing like an avocado, some shiitake mushrooms, or whatever you like. You can make a bunch of rice or quinoa and various types of beans in advance, store them in the freezer, and vary the sauce to get more mileage out of it before you get sick of it. I know you're not really looking to save money, but this is pretty cheap anyway!
I think a lot of this is just about establishing a routine and making it a habit. Cooking is really fun when you enjoy the final product, and despite the fact that people think it's a lot of work, it doesn't have to be. And then, when you have stuff already in the freezer, it's a lot less work to just take it out and microwave it than to get in the car, drive to a fast food place, etc. I lived on canned soup and frozen pizza not so many years ago, and now I can't believe I did that. So it is possible! :-)