There was a time where I wanted the Y axis inverted, but the X axis non-inverted, mainly due to playing a lot of flight sims like X-Wing and TIE Fighter in the past. I'm not sure when it changed, but at some point it became natural for me to use the right stick to physically move the camera rather than to aim my field of view. That's even bled over to the rare instance where I play first-person games, and that distinction of the camera vs. the field of view doesn't make any sense. So these days, if I can't invert both axes, everything feels wrong and a game can feel nigh unplayable. Basically, I'm the exact opposite of RavenWood.
So yeah, add me as another vote for axis inversion settings. There's no good excuse for not offering that option in any game these days.