Mark all as read
Power tip by @rjbs via Twitter: <shift>-<esc>
Shift-Esc marks all messages in every channel in Slack as read, and you should learn to use it whenever you feel overwhelmed.
Thanks @RJBS
- Do note it is per Slack, so you might have to repeat
- It will warn, but use with caution in the beginning, because you could loose track of things