This is the feeling you get when your around a person you are just starting to get to know on a deeper level. Its the warm fuzzies inside, the "everything is good with this person" feeling..and it makes you think of nothing else but that time right then and there. The honeymoon effect is something you want to last a long time..but your afraid that soon it will dissapear...which ushually it does, and subsides to a deeper and more knowledgable love of the other person. When the honeymoon effect is gone...it just gets started, and gets better!
My soon to be boyfriend told me "see..they call what we are experiencing the honeymoon effect"..and I think he was secretly wanting this feeling to last forever.