I recently built a couple of tables from kitchen countertop material donated by a friend of mine. I use the larger one in my wet area and the smaller one as a stand for my enlarger (it's just large enough). I built both at about the height of a kitchen table, so I'm most comfortable using the tables sitting. I also bought a cheap office chair with wheels, so I can roll from the dry area to the wet area without standing up. Previously, I had my darkroom equipment on some ranky old bedroom dressers that came with my house. They were high enough that I had to stand, and I found that my feet didn't like that. (My darkroom sessions are typically 2-4 hours long.)