I'm in a similar situation -- I don't have to make contact sheets, but I do. I'm fine with reading the negative (without a light table or loupe), but I have hundreds of rolls of film (mostly 35 mm, but 120 is now my norm), and it is much, much more convenient to flip through the negatives with contact sheet attached, then to lift each page out into the light to find the particular image I'm looking for. That being said, I will usually schedule one session to deal with contact sheets only -- it's boring, but it's fast and easy once exposure times are determined, and I can get all them done in one go. That way, the next time I'm in the darkroom I can concentrate on one or two images at a time, rather than deal with different mindsets concerning contact sheets, work prints, and final prints.