This pretty much describes the way I used to shop before I started reducing my carb intake. It's sound advice.

If you have a restaurant supply store in your area, you can also find good deals on bulk foods especially meat. In Washington State there's Chef's Store (formerly Cash and Carry)

I used to buy 20-30 lb top round roasts for less than hamburger prices. I would then hand grind enough hamburger to last my family of 4 for a month. (You can even cut steaks or smaller roasts)

If you buy the 3000ft plastic wrap from Costco you can wrap up 1-2 lbs at a time, and stack of you freezer.

Also buy individual spices, and learn to make your own seasonings (taco, spaghetti, etc.) Larger up front cost but a huge money saver in the long run.

There's a lot that you can do to decrease your food expenses even if your unable or unwilling to produce your own. This just scratches the surface