I never respond to instant messages instantly. Ever.
15 minutes later when I do respond in 80% of times the issue or question has been solved. Soon the people who keep pinging me all the time cuz they want to save 10 minutes googling stop pinging me. It’s quicker for them to do it themselves.
Slack is very helpful as a means to discover previous conversations and insights, for companies in multiple time zones and remote workers.
Channels for me are ignorable shared inboxes of CC-all email chains where I only pay attention if someone calls me out or if I’m looking for something.
Slack’s integrations to other services can be very helpful as you don’t need to go digging somewhere to get a quick overview of how some other app is performing or the status of some ticket.
It’s a tool. If you let it dominate your life it’ll harm you for sure and sometimes it can be hard to recognise when a ha it is developing and it’s having a negative effect.