Honestly, I only feel like DS9 overused the Mirror Universe (and that's more that I didn't find any of them that enjoyable, and more importantly, they didn't feel like they fit). TNG and Voyager didn't use it at all, and the two parter in Enterprise, was a one-off and was pretty good. These ones, I rather liked as well.
My main issue with Discovery at the moment is how unsurprising their surprises are. I can't even complain about spoilers despite having just caught back up with the series, because everyone guessed all the "twists" months ahead of time. As far as the mirror universe thing goes, people were guessing we'd go there right after Stammets does that gene therapy thing and has some mirror weirdness, and shortly after a bunch of people put the puzzle pieces together regarding Lorca given his un-Starfleet behavior.