Conveying your emotions to the people who have affected them (whether in a negative or positive way) is a good thing to do, but you have to be careful not to overwhelm anyone. Being sensitive to other people is extremely important today: your conscientiousness will go a long way toward keeping them from getting defensive about what you say. Gentle praise will go a lot further than wildly enthusiastic gushing, too: keep a lid on your enthusiasm and play it cool.