I don't think that Horizons split the playerbase like Odyssey does - but I have to say, how the online experience has changed for me over the past year or so (it all started with FCs to be honest and just got a lot worse with EDO); I remember some really awesome organic PvP/PvE experiences, be that pirating miners in Borann, defending those miners against gankers with other players (shoutout to
@Bigmaec), playing chicken with the likes of RoA, NATO and Harry Potter et al, CODE on one hand cramping our style while trying to fight a Hydra for the first time after the Gnosis misjump, and me spontaneously winging up with CODE some time later to pirate traders during a CG in my Cobra.
Those were darn good times, and I really, really, really miss them - and unfortunately I don't think we'll ever get that back because the game has changed so much in how it's structured (let alone the current situation from a technical perspective).... it makes me quite sad.