I have read many slave narratives recorded by the Federal government during the great depression. The former slaves who hated or loved their owners were relatively rare (and made the most interesting reading). The large majority of them when asked said something to the effect that their owner was "good" but didn't appear have much feeling in the matter... kind of like how someone might describe their boss at work.
I've also read some modern commentators who appear to be angry that slaves ever had a good time (like the one you mentioned). It is like they think slaves should have been miserable constantly. Many of the former slaves described their holidays (usually two or three times a year), the food they ate, music and so on. That appears to be offensive to some people today.
Slave owners typically lived in close proximity to their slaves, and spent much of their days with them. Just imagine what it would be like to live surrounded by people who hated you. You had to work out ways to get along with each other... I mean, if you didn't you could easily end up dead.
The most disturbing element that was common in the slave narratives was separation from family by sale. That was something that they dreaded. I read a couple of narratives that said their owners wouldn't whip their slaves, but any that didn't work would be sold, which was considered to be unpleasant fate, as you may never see family again. The most vivid narrative I read was of a former slave who described how she was sure her former owner was burning in hell for selling her away from her family as a child.
*edit* Oh and though I think were was close to zero that was positive about slavery, old former slaves saying they were "better off" as slaves wasn't particularly rare in the narratives. They were all aged, and most were in poverty. Quite a few had most of their families dead or gone, which was tragic.
Slave narratives are free to download:
https://www.gutenberg.org/ebooks/search/?query=slave+narratives&submit_search=Go%21
