I hear you on the coupons. My bill would be higher if I did couponing, mainly because I have access to the commissary. It seems best for people who really don't want to give up their pre-packaged stuff. Making a meal plan, too, just doesn't work for me and my husband - we have to have room for spontaneity or we'll rebel, lol.
For grocery savings, I've yet to find a resource better than The Tightwad Gazette - I have the big complete book, and it seriously puts many other frugality resources to shame. (Actually, I just bought another well-known frugality author's ebook, only to demand my money back because it was so far below the standard I'm used to!) Amy, the author, advocates pantry-based shopping rather than meal plan-based shopping; if you've been trying meal plans and it hasn't been working for you as well, give this a try! Most libraries have her books.
The pantry method from this book has worked well for me for years. I seldom do much meal planning except as in, what should I make for dinner tonight? I always have everything that I need, bought at the best prices possible because I basically only shop for sale items, especially loss leaders. Also fuels my creativity and I can usually easily go a couple of weeks without needing a grocery store, except for fresh produce or perhaps milk. Of course, to be able to do this, you do need to be able to cook creatively (as in not needing recipes except as idea starters) and also to bake, because children need to eat much more than adults and baking muffins, desserts, etc. helps to fill them up. But these are skills that improve with practice.