To count the bands from this genre I really like (at least parts of their discographies), I need less than two hands:
Atrox
Fates Warning
Madder Mortem
Mekong Delta
Psychotic Waltz
Sieges Even
Voivod
Watchtower
With the exception of Madder Mortem, Psychotic Waltz and Watchtower, my discographies of these bands are incomplete and of those albums I do own, there are also some I don't feel inclined to revisit ever again. What all of these bands have in common (maybe with the exception of Sieges Even's "Life Cycle" and Watchtower's "Control and Resistance") is that they all sound very different from each other. And both Mekong Delta and Voivod have had a very specific/unique sound more or less throughout their entire career.
Thinking about it, I could also add Soul Cages to my list, though I only have got their first two albums, out of which I like the second one ("Moments") much more.
Way back in the late eighties/early nineties, I'd have included Dream Theater in my list, but apart from the fact that I never liked them as much as any of the aforementioned bands, I stopped buying their albums after "Falling into Infinity" (which I found totally boring) and haven't listened to them for more then two decades. Well, I did revisit "Awake", "A Change of Seasons" and "When Dream and Day Unite" once for the year polls resp. the song survivor game (has the latter already been finished?), but right now, I don't see myself listening to them again. (I know: never say never.)
In the middle of the nineties, I'd also have included Shadow Gallery in my list. Way back then, I enjoyed their first three albums a lot, but nowadays, they leave me cold. I still remember that I was really euphoric the first times I listened to their debut, especially the guitar solos, but when I revisited it two years ago for one of the year polls, it did do nothing for me.