Hard to say right now since I am only on my first series rewatch... so I won't skip any this time around.
Other eps lower on my list that would be
possible skips for future rewatches:
Resolutions (I might get flak for that one, but I hate the monkey and the whole ep seems like a tease with no real
resolution)
Favorite Son- a disappointment partly because I liked The Thaw and this one is helmed by the same guy. My least fav character gets the center stage in an ep that I found borderline laughable in its ridiculousness. It's dumb in a way that even Threshold wasn't dumb... in my opinion.
11:59 (possible, even though I love Janeway her family history was made incredibly B-O-R-I-N-G by TPTB)
Haunting of Deck 12 (maybe- I'll know after I rewatch it first time)
Spirit Folk (Fair Haven amused me, but this one didn't do much for me)
Fury- probably for the same reason(s) that others would also skip this one. Tuvok's cake looked the bomb though.
Good Shepherd (ho hum on the ho-hummers... in other words the slackers on VOY bore me a bit, plus at least one them was a j-hole on top of that)
the one with Flotter (sorry Lynx! ...but I do love Naomi)- can't say I was bored with this one per se, but it wasn't amongst my favorites. Maybe I wouldn't actually skip it. I'll find out by the end of the summer or thereabouts.
Season 4 I can't see a single ep I'd be likely to skip (though I can understand why you'd pass on Unforgettable).
...really I found this show to be pretty consistently good from start to finish, I'd probably skip a total of 5 eps or fewer overall. Aside from season 1 and early season 2, when the footing maybe wasn't fully established, the only faltering moments for me were mid or later in season 6 and a bit in season 7 (too much of the Doc and not enough Janeway). That isn't to say there are hit-or-miss eps in other areas (season 5 fore example, is one of my 2 favorites, but it has more eps I'd be likely to skip as well).