Actually, I don't think of southern plantations at all. I live in the South, and that's a wholly different image from what I get when I think of Amarr slaves.
When I think of Amarrian slavery, I think of Ancient Rome. Golden fields of wheat tended by flocks of mostly white slaves (Ealurians, which are the majority - not Minmatar), scantily clad household servants in Princess Leia bikinis, the omnipresent sound of chanting and monk-music, and roaming pairs of slaver hounds occasionally fighting each other. Despite the slavery, I always get the impression of a very "golden" society, full of riches and luster that covers the corruption and grimdark.
U.S. Southern plantations were humid stinky farms of cotton and tobacco, ringed with spanish moss and oak trees, dirt roads, and sweaty people with a heavy drawl. Most slaves were black, and were dressed poorly if at all. It was grim, real, and pretty miserable. Hell, even living in modern times down here is miserable.
Maybe I've got rose tinted glasses, but I try pretty hard to avoid thinking of Amarr slaves anywhere near the equivalent of real slaves.