If you use Windows, you can use AutoHotKey and add emojis via Markdown with [this script][1].

There are cases where I see emojis are useful. For example, in Software Recommendation there is a [feature request to have checkbox](https://softwarerecs.meta.stackexchange.com/q/2771/6389). Or when the conversation seems to be emotional, an emoji can reduce the heat but still convey the information.


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<sup>Some other useful AutoHotKey scripts I recommend too: [LaTeX][2], [AutoCorrect][3], [Quick Type HTML Tags][4]</sup>

[1]: https://github.com/alexmick/emoji-to-ahk/blob/master/custom_short_names.py
[2]: https://gist.github.com/kbauer/e8fee6514d124d5961f51fd7ba571bfd
[3]: https://autohotkey.com/docs/Hotstrings.htm#AutoCorrect
[4]: https://autohotkey.com/board/topic/68904-quick-type-html-tags/