Agreed, most people who claim to eat 6 times a day are counting shakes and stuff that I would considera snack, so most of them dont need much preparation.
I do pretty much what gregon said. I cook most nights and usually cook 3 or four serves that way I can have one for lunch the next day and another serve at a different time or put it in the freezer for a night when I cant cook.
Quite often I will also roast a 2-5 pound peice of meat which I will have on sandwiches through the week.
If you are really short on time you can cook for a few days at a time but I dont find it that much more efficient