My Sis-in-law and her husband renewed their vows but I can't see the point either. DH and I have been married 44 years and I feel no need to re-iterate the promises I made the first time round. I know my DH would hate the dressing up and the fuss.
Someone in our village did - the husband arranged it to follow, if I remember rightly, the wedding or marriage blessing service of their daughter and it came as a surprise to to the wife.
If you both like the idea, fine. If you don't agree, find some way of commemorating the event that you both like - the suggested cruise maybe. It'll be just as special and, as already said, the original vows still stand.