Even though your personality might be to observe first, which is great, I am also happy that your boss thought to include you early on and wanted to hear your voice and saw you as an expert. I have had the opposite experience in many occasions, when I did have opinions but I had to fight to get a word in. In college, I learned to speak up more because I noticed that mostly white male extrovert students got all the speaking time, even if they didn't have much to say. It was hard.