Wedded BLISS

OK, here's this something that I just want to find an answer to.

Ya'll know a lot of people these days move in together first then later on decides to get hitched, right?

To me moving in together before tying the knot kinda defeats the purpose of you looking forward to spending the rest of your life with the person you married. I mean, you already moved in with him, for Pete's sakes! Isn't the whole point of getting married is for you to enjoy marital bliss with your lifetime partner? Start from the very beginning; get to know each other some more now that you are living as husband and wife legally! Where will all the excitement be in a newlyweds' lives if they'd already been living together like husband and wife before officially tying the knot?

With that said, here is my burning question:
Living Together: MOVE IN BEFORE Getting Married or MOVE IN AFTER Getting Married?