Refuse the generic. Don't let a character sit down at a wooden table. They can rest their elbows on rough planks, or cheap Formica or polished oak with coffee stains, but never simple wood. And if you are having trouble imagining just what kind of table they are sitting at, it's probably not important enough to bother including. Just let them sit down and find some more interesting feature to describe.
Description is like spice.
It's the heart of the flavor, but too much will dull the taste-buds. And this brings up perhaps the most important part of description. Make 'em work at it. The more you make a reader use their imagination, the deeper they will be in your story. Obviously, your vision and their vision will be different, but as long as they have a vivid picture in their minds of the world you have created, you have their trust.