Agreed.

For what it's worth you can also Ctrl/Cmd-T and search for someone to begin DMing them.

Did you ever know that you’re my hero?

(I had no idea. Thank you. That’s a nice shortcut.)

My favorite is shift + alt + up/down arrow to move to the next unread channel. Works between servers too. Super easy way to knock out hundreds of unread messages at once.

Works in Slack too.

Is there a way to swap between two channels/DMs in the same server? Similar to how alt+tab or ctrl+tab would work in Windows?

Looking for CTRL+K?

Ctrl+K just searches for channel. I was looking more for something where I could switch between 2 different channels quickly. Like I'm messaging someone but then have to quickly switch to a different channel to address some issue and then quickly switch back without having to click on or search for the previous channel.

Ctrl-k initially highlights the last channel you were in, so Crtl-k RET will bounce you back and forth.

Except for threads, which bugs me daily.