No, Whoever told you that is retarded. Queens are NOT WORTH THEIR POINTS. Knights require more finesse than anything else in the game to use right and are usually the biggest game changers.
Yeah, sure, your "Queen can pick off the stragglers" but there's kind of the issue of there being what, 9 pawns for every queen? And 9 pawns are able to cover themselves pretty well. Enough of them and they can pretty consistently cover themselves.
To break a proper pawn swarm (anyone with brains enough to use it better than a retard) you HAVE to sacrifice SOMETHING. And in a Knight+Queen list you just DON'T have the pieces to sacrifice. Unless you're planning on using your queens as sacrifices so you can break their lines with your knights, but if you're doing that you'd be better off taking any other piece, particularly pawns. Or, like you're suggesting, send your knights in to their deaths so the queens can mop up the things that murder the queen the moment she kills a single one.
Jesus, you fucks are retarded.