What to do about massive slacking

In the current DF2010 build, the only important things are a bed, to make it a bedroom, and a cabinet, because that's the only storage your dwarves will currently use, so reducing the amount of junk left around as they randomly discard their clothing (junk that can't be cleaned up by any means short of a magma scrub or atom smashing, because it's still marked as owned).

Any additional non-movement-blocking furniture is fine for bringing up the room value (and therefore the happiness it grants); I like chests, bags (it's easier to get high-value bags than most other furniture), weapon racks and armor stands. Even a movement-blocking furniture item, like a statue, is okay if you put it behind the bed (and designate the bedroom before you have it moved in, so you get the full value of all your walls).

There is one possible reason not mentioned above. In your dwarves' standing orders is an option disable all wood-hauling. The standing orders are where you can change settings like telling your dwarves whether to gather refuse, whether to auto-loom thread into cloth and so on.

o to get into the standing orders screen, then w to toggle wood-hauling on or off.