Artistic images need space, especially images that aren't meant to be place together. Otherwise their color would collide with each other and ruin the visual experience for them.
If flickr wants to become a social network that features family photos maybe that's the right layout, but I think most of the pro users weren't paying $25 a year for that purpose.
Flickr is no longer a valid place to share pictures for photographers who care about their visual quality. That made me really sad today.