EA, a Coptic person I know recently told me that the COC is planning or wants to put the vows (a western idea) in the Coptic wedding ceremony. I guess that would make it nice. I've been to Greek and Coptic weddings where the procession down the aisle was with the traditional organ tune "Here comes..." rather than a chant by chanters or clergy but never with vows. If this is true, it will be ineresting to see how things turn out.
I know in the good 'ole US, whether during or before the service, all couples must be asked whether or not they wish to be married; this is a legal requirement for the validity of the ceremony. In the EO, the priest asks the couple before the ceremony begins. So we don't have vows per se, but we have been forced to openly ask the couple, an action which was unnecessary in the past since one's presence at the wedding was seen as consent.
"O Cross of Christ, all-holy, thrice-blessed, and life-giving, instrument of the mystical rites of Zion, the holy Altar for the service of our Great Archpriest, the blessing - the weapon - the strength of priests, our pride, our consolation, the light in our hearts, our mind, and our steps"
Met. Meletios of Nikopolis & Preveza, from his ordination.