I have the 128 for the same reason, couldn't justify spending more. It's sufficient for me bc I have reached the point where basically everything I need is on my drive now and I have about 42 GB left. If I uninstall the two Steam games I have installed (which I rarely play but am too lazy to uninstall) I would gain back like 20 GB. So space isn't an issue
However, I also don't binge on music and movies. I only have about 13 GB of music and delete TV shows/movies once I am done with them. If I had a bigger hard drive I wouldn't bother to do that