Skull, most commonly in italian you would say "ti voglio bene", while if you say "ti amo" it's a much bigger deal that you would only say to your valentine..or little girls say it to their dads. But in general amore in italian can have a wide mening like love in english, however expressing it in the form of I love you(ti amo)has a strong connotation of relationship.
Sounds how I use my Spanish counterparts. "te Quiero" is used easily and not big deal, it also means "i want you" so i dont hold it to much serious use. "te amo" I reserve to a special and very sincere use, like the cliche movie "i love you" moments that mean everything in the world to the girl. -_-
I also use "Te adoro" when I admire them. Meh. LOL. Thanks for input Seha! Us silly romance language users =P (I think you already know Spanish you multilingual person you)