I just freed up 3GB of disk space due to random node_modules directories laying around old projects and experiments on my computer.
The project is called npkill and I found it on Reddit today. I have used disk analysis tools before, but they have made it hard to find small files which eat disk. Yes, Grand Perspective helped me find out I had 15 instances of Chromedriver due to node_modules, due to different open source and client projects. But npkill has helped be truly reclaim my disk.