A lot of people will tell you it is the jittery, butterflies in the stomach feeling. While that is part of it, there is another part which is so much more important. It is the feeling of calmness you get when you see them. You know that part you never knew you were missing has been found.
It's no good asking questoins like that of mere mortals. You need to ask a professional. Go to the song writers. Here's how Alan Jay Lerner thought it felt:
I have often walked down this street before
But the pavement always stayed beneath my feet before
All at once am I several stories high
Knowing I'm on the street where you live.
You will know it
When u find it .
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