I love emojis in commit messages when you use Github. I think they add a bit of flavor that looks really nice, possibly even more professional if you use them in a simple way.
But that's where emoji usage should really end for most projects. Unless your code is emoji-centric, there really shouldn't be emojis in code. I'm a Linux user, so emoji support outside of browsers is limited to colorless CSS symbol font style graphics, which are very hard to even recognize unless the font size is increased by a lot.
To be fair, modern editors tend to have built-in emoji support, but if I need to do anything in the terminal, that's where things tend to get annoying.
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