I am finally on Season 7 of DS:9 and I don't remember these episodes at all. I suspect I'm viewing them for the first time, along with the second half of the sixth season.
As I recall, my life became complicated around the time they originally aired, so it is likely that I missed them the first time around. Which makes seeing them all the more delightful.
As for season six, two episodes are amazing to me. In the Pale Moonlight and The Sound of Her Voice were both breathtakingly good writing, with the former being a critique of the whole premise of the Star Fleet Paragon and a very adult interpretation of what it means to do things for the greater good and the latter a brilliantly well-written science fiction ghost story.
The director and/or actors made a choice in the penultimate scene of The Sound of Her Voice that I will remember for quite a while. When they are convincing themselves that the voice that they have been communicating with for the last week was actually time-shifted, you could see the actors making the choice to have the characters avoid each other's eyes and hesitate slightly with their explanations.
They weren't explaining how it was possible to have a conversation with a corpse. They were making excuses so they didn't have to admit that they'd been dealing with something behind their ability to scientifically explain. Which is why that talk of time-distortions (which were never mentioned before) suddenly came up. Because the rational men of science couldn't admit they were in a ghost story.
And thus they turned what could have been a trite ending into a lovely, spooky, even haunting one. No pun intended. Beautiful storytelling.
Also I like Ezri Dax. Even better than I liked Jadzia. Don't get me wrong, if I were in trouble, I'd want Jadzia to come to the rescue. But if I needed to talk to somebody or just hang out? Ezri would be the one I'd text. :D