When I last looked at this on my machine - about 75gb of photos, I tried one or two bits of software that were going to help me...........But I decided that life was for something else.
They are reasonably well filed, and I can normally find what I want. Normally.
So I stopped doing it. All I did in the end, once deletion therapy had me very bored, was to separate the ones I am unlikely to ever refer to in to a different file. So that "others" file is now 15gb, and the main one is 60.
Like you, I have a ton of unused storage.