Of course I do! I use my judgement on most things but some things you can tell by smell/look without having to look at the "use by___" date. From my experience, most things have a much longer "good" time after the expiration date.
Now, when something has gone so long in my fridge that I can't even recognize any more it is definitely time to get rid of it. I've been known to find a container of just green, powdery looking stuff in a container back in the corner of my fridge that is no longer recognizable to the human eye.