I try to avoid conveninence foods if I can - I don’t really want the preservatives and things, not to mention they’re more expensive, and some of them are downright silly. When I found out what’s in pancake mix (that I had all of it in the pantry anyway) I sort of swore off most of them. Some things really are worthwhile, though.
As for what a “convenience food” is, I wouldn’t call frozen peas or canned tomatoes (the good ones, the Muir Glen ones) to be convenience, but canned beans are sort of on the borderline and canned soup is way over it.
I nominate 5 minute couscous. Granted, I’ve never had the kind of couscous made by good Moroccan women who slave over it and fluff it with their hands and such, but I think the 5 minute kind is awfully good (certainly a lot better than, say, Minute Rice.)
What else do you use?