Lolz... Just like you, I was never a big fan of emojis especially when I'm in a serious discussion. I preferred letters and I never used Emojis until 2 years ago. That was when I started using emojis and it's been a very interesting adventure.
As for stickers, I think that's more popular in WhatsApp. I'm not yet a big fan of WhatsApp so I don't use that one. Hehe.
Well, all these can still be really annoying when used out of proportion, but if it's used rightly, it can make chats more interesting. Hehe