I don’t know for sure, but if I had a guess:
1. It’s an immediate reaction to a punchline that doesn’t take up a lot of panel space
2. Because of 1, it’s also easier and faster to draw
3. It can itself become a running gag, as you mentioned the Plop
4. Because it’s so iconic, you immediately know what it means and where the punchline is supposed to be
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