I suppose it can be helpful if seeing a folder full of revisions would otherwise drive you crazy. I mean, I fully admit I also sometimes just dump a mess from my desk into a drawer just so I don't have to look at it constantly.

Also, if you have a consistent habit of writing accurate and descriptive commit comments, you may not need to rely on being able to compare line-by-line diffs to see what's changed between versions.

I think the moral of the story is that git is a somewhat suboptimal tool for this purpose and it whether it's helpful at all depends far more on your habits and discipline than on the functionality it provides.