Working in video production, we're constantly juggling large amounts of media across multiple external hard drives. DiscCatalogMaker has been invaluable in keeping track of where to find projects/media, PLUS a quick way to check how much space is left on each drive. It saves so much time and hassle not having to individually mount and eject each drive just to see what's on it. DiscCatalogMaker is a HUGE time saver and one of the very most useful pieces of software in our daily toolkit.
The only thing I would like to see improved is for each drive to display with the custom icons I assign to each (rather than uniform, generic hard drive icons). It's a small thing that just helps visually locate drives in the list more quickly. To be fair, this feature could already exist and I just haven't figured it out yet.