I've totally had the addicted-like-a-drug reaction to McDonald's. (and I'm talking recent, too... It barely takes 3 days of having the stuff to get the cravings.) It's hard to get out of. Jeesh. Fast food
is easy, I'll agree with you... so the trick is to make it so there are other, better things within reach that are even easier. Sandwich stuff is a great idea. I compensate by making giant pots of soups and chilis and freezing them in individual portions -- instant lunch! I just grab one in the morning and don't have to think twice. So the trick is to find a way to compensate.
And remember, getting healthy doesn't mean you have to give up hamburgers and french fries forever.... Even if you buy frozen fries that you bake yourself they'll be way better than fast food fries, and a 100% extra-lean ground beef patty made with your own two hands will be MUCH more satisfying than the soggy lump of whatever it is they pass off for hamburgers at fast food places ever could be!