My wife and I use slack. In the past ~6 months we: got engage, planned a wedding, a wedding reception (2 different dates), honeymoon to Australia, a baby, a new house, and renting out our townhome. While slack is really a gussied up messaging platform, the extra polish they have on things like search, pins, and documents, made planning and executing on 3 of lifes major milestones significantly easier to manage. So fa…
That's a busy 6 months...
Slack helped us keep focused and organized without a lot of effort on our part.
Also we had a lot of luck, pretty much everything went according to plan.