I'll start by saying that of course no one ever gets married expecting to become divorced later. I know it was NEVER an option in my own marriage for either of us. Until one day, for him at least, it was.
The good news in my situation is that Texas is actually very fair about divorce. Each spouse gets what they brought into the marriage, and everything acquired during the length of the marriage they split evenly. Debt included. No alimony, no taking anyone to the cleaners, unless they jumped through some serious loopholes somehow.
I like what Joseph said - if it helps relieve tension and stress, then do it. It's no one's business but yours and your spouses, and if you are both more comfortable that way, there's certainly nothing wrong with it. One of the main causes of divorce is stress over money. Wouldn't it be ironic if the very reason for a divorce could have been prevented by having a prenuptial agreement?
I don't consider a prenup an "in case we get divorced" paper. I consider it a contract outlining what both parties agree to in a marriage. It's an "agreement". I'm not sure how that's really much different than taking vows.
Honestly though, these are problems for millionaires. Since I'm not one, and I'm not likely to ever marry one, I don't really have a horse in this race.