Using the browser tool in not really an option. When opening a substance, you just see its file name, e.g., bricks_004.sbsar. If I go to the online browser and search for 'bricks_004', no matches are found. If I search for 'bricks' 29 matches are found, bricks_004 is listed under "Colored and decorative bricks".
However, this is only moderately better than having to use the viewer. Here, I can get back a list of bricks. However, it is difficult to figure out which are relevant, as I own bricks 4, 5, 9, 15, 20, 21, 26, 32, and 34.
All the makes it very expensive in terms of time to browse and select a substance.