Personally, I don't mind that a lot of the community has shifted to slack/discord, I really enjoy hanging out on those platforms in fact.
However, because my timezone doesn't sync up well with the active period of most of the community (ie 9pm here is like 4am in USA), so I'm either sleeping or working when slack/discord is at its most active.
Even when GH was at its most active, 24 hours wasn't really a long period of time, and I could easily catch up on my Watched threads after work (I can't really "catch up" with slack/discord, it's 1000s of lines of uncatagorised IMs). Instagram is probably the closest experience to that, but media:discussion ratio on IG is a lot higher than GH, so it feels like less of a place to hang out than it feels like a "look what I got" type place.
All that being said, I haven't been as active in the hobby this year because I managed to get most of my goal boards, and I don't don't have a burning need for any others any more.