I have to agree with you.

I bring a large tarp, 4' x 8' I think... It has grommets all around it's edges and would make a great shelter. It's blue on one side and reflective on the other. You probably can find this in the camping aisle of any decent retail store.

It's flatter although longer than the emergency bivy, but you'll use it more (to lay down on the ground, etc.)