We say "I love you" in my family the way some families say hello or thank you. Frequently, in all tones of voice, and in all contexts. There's the "I love you" that is said in a somewhat tolerant tone, as if to say "I think you're crazy with what you're doing right now, but I love you anyway". There's the "I love you" that is said in frustration, as if you were saying "It's a good thing I love you, because you're making me absolutely crazy right now!". There's the truly tender "I love you" said in the tone that conveys "I have no idea how I got so lucky to have you in my life and I really, really love you." And there's lots more. And we say them all.
Some people feel that if you say those words a lot they'll lose their significance. I think if you mean what you say, no matter how frequently you say it, it doesn't lose a thing. Instead the other person will never doubt that you love them. They may take it for granted and not appreciate the security they have, but they'll never wonder if they're loved.
For other spins to love on the topic of love, head on over to Sprite's Keeper and give her some love!