I don't really your use of emojis as being overused.
I think the use of the laughing face emojis, when used in this context, in the only emoji that sticks in my mind. It then becomes associated with some members. Right up to the point where I can predict which members are about to respond in that way. Stringing a few words together would be better than using the laughing face in that way. I think that the use of that particular emoji in that way becomes quite revealing.
As for other omogies, they don't grab my attention in the same way.
Yes, and to me it seemed really impressive. I wondered if it was possible to build up a picture of someone just by thair emoji responses, and nothing else. I even started to wonder if I'm subconsciously building a picture of that person's age. Or at least in maturity if not in years. In a way, I started to find that person fascinating.
This is a challenging one for me to interpret sometimes, as it can mean different things depending on the thread as a whole, a post in particular, and how I 'perceive' the person who responded with that emoji.
I think a simple emoji can represent many words, even an untyped sentence. It might even represent something with some accuracy. Unfortunately, different people have very different opinions of us, which might contradict opinions that others have of us. I think when using emojis, we 'might' have to think about our audience, and how different personalities might interpret our emojis. We might even think that there of a few people that we couldn't care less how they interpret us, as they might always get it wrong regardless of how clear we might try to be.

...
I was genuinely laughing out loud. Yes, I sometimes think this too. Then later, I take a rest in other threads by not putting a like on any posts. Then later still wonder why the hell I am thinking this way! And then wondering what kind of impression my inconsistency might give.
I used to do and think a similar thing, and then at one time started using emojis aimlessly for a couple of days just to snap out of my own self-awareness.

I wonder... perhaps we have all done that at some point within forums. I personally just smile about it and let it go -- or I at least attempt to.
Absolutely! We can't always control how some interpret us though.