I agree with Brermom that this nation is becoming very wasteful. How many people would change their habits if there was no garbage pickup? If you had to deal with your own garbage, either by reusing it, burning it or burying it? What I think would happen is this: people would not use plastic utensils, plates, cups, etc... and would also start composting their vegetable waste. I did an experiment once to see how much I could get my garbage down to for a family of 5 (young kids). I composted like crazy and recycled everything I could. I got it down to one kitchen garbage bag per week (and that included two bathroom garbages and cat litter). I think if we start thinking about what we use and throw out and where it GOES, we might start reducing our waste.
Back on the thread, I reuse some ziplock bags, paper bags, I save all plastic bags and take them back to the store, I buy in bulk and whole foods to reduce packaging costs and waste, and I shop in consignment stores first before hitting Target. One thing I do that some people might find annoying is that I refuse to buy any books lately, just hit up the library. If it isn't in, I wait.
Down in Disney, I will split meals between my kids and me/dh IF I don't think they will finish a full meal or it is just a snack. Waters get shared (unless they want to carry their own all day). Desserts always get shared (we get the big ones meant to be shared). It isn't about being cheap (well, somewhat), it's more about wasting food and money. But I never bring canned food into Disney!

Granola bars and fruit snacks, maybe, but not canned corn.