Forestry.io is a CMS for static sites that includes a media management interface you might like[0].
We also support uploading images to Cloudinary instead of committing them to your git repo to prevent repo bloat.
Depending on what you're trying to do, a non-CMS option that will remove some of the tedium of inserting all these images is to take advantage of Hugo's Page Bundles feature[1]. With this you could just group a bunch of images in a folder and iterate over them in your templates.