In the Slacks I frequent they are often used for a ACK/+1 without creating the noise and interruption (from notifications) that a new message in a channel or th

In the Slacks I frequent they are often used for a ACK/+1 without creating the noise and interruption (from notifications) that a new message in a channel or thread would give. Also they can be used for quick votes. Github signal/noise has increased significantly from emoji reactions reducing all the 'me too' comments.