Use a lint roller.
I know, I know. You probably think I'm silly/crazy/stupid because this is so simple. But I didn't think of it until a couple months ago and I talked to a few people and they hadn't thought of it either.
If your couch collects crumbs, dust, and lint like mine does, using a lint roller is an easy way to do a quick clean.
P.S. Do you say couch or sofa?
P.P.S. A similarly quick & easy trick for baking cupcakes and muffins.