Maybe those weddings are a bit of a reaction to the standard viewpoint I see in society, that you should lose yourself in each other and merge into a kind of combo entity, spending all your time together, feeling very uncomfortable if you're apart... until of course you find out that you ARE actually different people, with different desires and needs, then you divorce.
OK OK highly cynical there

But seriously, it sounds as though you're half-quoting that Kahlil Gibran (sp?) poem... here's the whole thing - i went and found it because I wanted to see those words in context (I decided to add a commentary to make my understanding of it clearer) -
Then Almitra spoke again and said, "And what of Marriage, master?" And he answered saying:
You were born together, and together you shall be forevermore.
You shall be together when white wings of death scatter your days.
Aye, you shall be together even in the silent memory of God.
But let there be spaces in your togetherness,
(you don't have to be together 100% of the time, or miss each other desperately when you're apart for a day)
And let the winds of the heavens dance between you.
(give God a chance to speak to you alone)
Love one another but make not a bond of love:
(love your spouse, but don't need him/her so badly that you'd give up on life without them)
Let it rather be a moving sea between the shores of your souls.
(acknowledge that sometimes one person will be more loving, sometimes the other. If I'm drained, hubby looks after me... and vice versa)
Fill each other's cup but drink not from one cup.
(serve each other what the other needs... eg. don't speak YOUR love language, speak your spouse's. i think the above speaks to not requiring all things to be shared, eg. taste in drinks)
Give one another of your bread but eat not from the same loaf.
(much the same as above. share your interests and joys, but don't demand participation)
Sing and dance together and be joyous, but let each one of you be alone,
(share your hopes, dreams, joys and fears, but acknowledge your own responsibility to deal with them/make them happen)
Even as the strings of a lute are alone though they quiver with the same music.
Give your hearts, but not into each other's keeping.
For only the hand of Life can contain your hearts.
(don't become so needy that you can't function without the other person. GOD wants your heart to be his first and foremost)
And stand together, yet not too near together:
For the pillars of the temple stand apart,
(present a united front, but don't lean on each other too much)
And the oak tree and the cypress grow not in each other's shadow
(a little space is often required to let a person reach their full potential. That might involve not insisting spouse always watch tv with you when they should be working on that novel, or whatever)
I think there are some very important boundaries-type concepts there - some might see it as advocating living in the same house but living completely separate lives. I don't see it that way. I see it as advocating MY idea of what a marriage should be, which is well described by what Singin4Him said -
Singin4Him said:
We are created different so that we will fit together like a puzzle, puzzle pieces are different but similar so that they fit with each other. We also need to allow each other to be used in ways we do not have in common, for example my husband is a web designer for the Univeristy we attend and I have no interest in web design at all haha.
Hope that helps.