I come from the opposite direction, where I was thinking too much. In the sense that I am quiet in most conversations, because I need to think about what to say back, and most conversations flow quite quickly, and I end up with a response well past the point it's applicable.<p>This is bad for two reasons:
1, if you don't say anything, the default assumption is you don't know anything, unless you have well known achievement in the field. Now your peers will eventually learn what you know, maybe even more than they do, but it takes time, and modern life is fast;<p>2, you don't have to be wise/correct/knowledgeable in all conversations, especially casual ones where people are just shooting the stars and will forget what was talked the next day.<p>The real tricky thing, the thing that distinguishes a <i>wise</i> man, is to know when to speak like a fool, and when to dive into deep thinking, and when to shut up.