Shots of my Lego room - total size about 95 sq ft of usable space.
Build table is 6 feet long, drawers hold baggies, instructions, & shipping supplies.
Room contains about 250,000 parts (give or take a few) in the various bins and bead boxes.
Organization - parts are organized by BrickLink Category, then part number, then color (bins are all labeled with part numbers). The elements in the shoeboxes are in zip-locs, the bead boxes hold smaller elements. Large categories (bricks, plates, etc) get their own section, smaller categories share sections.