Less is more?

I made guacamole again this afternoon, but I ran into something of a predicament: I didn't have a lot of cilantro. In the end, it tasted reasonable as usual, but it makes me wonder what the effect of the spice is. Last time, I used probably at least half a tablespoon more of cilantro than the recipe called for, but I don't remember any notable difference. Something that I'll observe next time I make guacamole...