I agree that making a bigger meal and either freezing half or eating for two nights is easy. We eat some variation of tacos quite a bit. Tacos, quesadillas, taco salad, fajitas, taco casserole. You can easily make it healthy with lean ground beef or use ground turkey.
Same with lasagna or any other pasta dish. I use ground turkey to make it healthier and just jazz it up with Italian spices. You can also buy ground turkey Italian sausage and I've used that before as well.
Chicken in the crock pot is good, so is chili or vegetable soup. Grilling is fast and easy and I grill quite a bit. I do chicken, steaks, pork chops, lamp chops, etc. I just spice them with something (salt, pepper, Lowry's, herbs, salad dressing, etc.) and grill it up with a salad and a veggie side dish.
I think the thing that makes it easiest is having a plan as to what you are making every night of the week. Of course you have stuff on hand for other things if you change your mind, run out of time, run late, etc., but for the most part if you buy for the week with a basic menu in mind it makes it a lot easier to get things done each night.