Absolutely.

As I mentioned, we have 150+ rooms that we chill in, and most of our day-to-day work practices are tied into chat. Mention someone's name in a room they're not present in and we send push notifications to their phone and desktop- works great to pull people in as needed, without needing to distract them with the noise of being in the room 24/7.

Our ops team is particularly in deep with chat. Instead of siloing everyone's process off individually in SSH sessions, many operations happen in chat, so everyone can learn and help out when diagnosing problems. They've built some really fascinating tooling around the problems they face- if you're interested, check out @jnewland's talk on ChatOps: http://www.youtube.com/watch?v=NST3u-GjjFw