I usually try to remember to click the Kudos button if a fic made me happy in some way--like, maybe there was one part I really liked, or maybe I loved it but would feel weird talking about why (I loved the other poll's option about kudos'ing anon "because of REASONS"). Or maybe it was completely amazing, and I just can't think of anything to say/don't have time/don't feel like stressing over writing a good comment right now/whatever. The point is, I try to click Kudos when I read a fic I enjoy.

That's why I absolutely love getting Kudos notifications--I always interpret it to mean that I wrote something that made somebody else happy, even in a very small way. And that's awesome! :D