Well, I say, "I love you," a lot. I do it when someone makes me laugh, out of habit, I would say, "You know what, I love you." Of course, I don't mean that version of the words to be too strong.
I do also tell my friends that I love them, because they are too important to me for tha to go unsaid really, and we've been doing it for such a long time that it's become second nature and easy.
I have never told my Step-father that I loved him, maybe because I was practically an adult when him and my Mother married and I didn't feel the need to be that connected with him - I'm still not all that connected with him, as I don't need the father figure in him, and I don't see him as that really. So that's one person I would never be comfortable enough to say that to. My mother herself, it took my a lot of years and a lot of changes in our relationship for me to say that I loved her, I always have, but she just made it too hard sometimes.. lol. Now though, we're close, so it's a lot easier.
I tell the brats I love them every time I put them to bed or if I'm leaving.