I have already seen everything Trek some more than once already. I always get a bit sad on the last few episodes of a series. I am going to miss the characters and seeing them continue to grow and interact with each other.
The same thing happened when I finished my rewatch of DS9. I think it hit my harder with DS9 since that those characters had such a good chemistry with each other.
Once I finish Voyagers I plan to start watching TNG right away. I havn’t done a complete watch through of it for many years. I usually get the first 2 or 3 seasons before getting distracted. I have been looking forward to watching it again.
I like seeing realistically flawed characters in star trek. Not “under alien control” flawed, but “seems to think they’re doing the right thing somehow” flawed. The last couple of seasons of enterprise, where archer did some really dark shit and hand waved the morality with “we’re facing an existential threat!” really hit home during the bush era.