Whenever I go to sync my photos to my computer I see all "pocket photos", screenshots no longer needed, and duplicate shots I'd prefer to delete. However I can't do this from my computer where it would be sooooo much easier. This is not just because of the UX, but also because you can see the images larger.
I don't want to waste double the space on my phone and computer and have to do double work. I also don't want to spend my time crouched over my phone inspecting and slowly poking with my finger when I have a full screen, keyboard and mouse interface at my disposal.
[Aside: The conspiracy theorist/negative karma in me believes apple sets this up intentionally so you run out of space faster and need to buy icloud storage or devices with larger and larger storage the next time around.]