On the one hand, I understand where you're coming from. I always wanted a nice wedding (not extravagant and expensive -- I knew that wasn't going to happen, but nice). If we'd been married at the courthouse, I would've felt like I'd missed out on something. It would've been like losing a dream, and it's a day that can't be "had back".
However, that dream wedding ideal must be balanced with common sense. EVERYONE has said, "Don't do it" -- and I'm saying the same thing. Let's talk about WHY you shouldn't do it:
I googled a credit card repayment calculator, and here's what I found: If you borrow 40,000 at 18% interest (and many cards charge more!) and you make fairly minimal payments of $600 per month, the calculator says it will require INFINITE MONTHS to repay the loan. So if you pay only $600 per month, you will literally NEVER pay off the debt. If you can repay $1000 per month, you will pay off the loan in 62 months (think about that -- that's over five years). If you go with the $1000 per month figure, you will have paid back $62,000 total by the time you're through; that'll be $22,000 in interest!
Totally serious question: How much extra money do you and your fiance have right now each month? If the answer is less than $1000 per month, then you'll have to figure out HOW you could repay the loans. Also, is he willing to go into debt for a wedding? This large loan will affect him as well as you. You don't want to set yourself up for marital strife by creating a debt that he will be unwilling to help repay.
Let's think about that figure. $1000 per month. I don't know what you and your fiance do for a living, but $1000 per month is serious money to most of us. It's the difference between living in your own house, driving a nice car, having a decent clothing budget, eating out occasionally, starting an account for your retirement . . . and living in an apartment, driving an older car, never taking a vacation, and living paycheck to paycheck.
What about the five years? Where do you expect to be in five years? If you're like many about-to-be-marrieds, you might anticipate that you'll be in a house, perhaps looking towards staying at home with your child . . . this wedding debt could prevent those things from happening.
Unless one of you is about to embark on a very lucrative career such as heart surgeon or CEO of Coca-cola, or unless you expect to receive a large inheritance soon, this kind of debt for a wedding is in no way worth it! Look over your ideas and decide WHICH ONES are most important to you. If I were making the decisions, I'd choose an inexpensive dress (honestly, few people will remember it beyond long and white anyway), have a mid-afternoon punch-and-cake reception instead of a sit-down dinner, choose inexpensive flowers and a small photography package (supplimented by family member pictures). Look into rings from a pawn shop; it's amazing what's out there for sale -- cheap! Find a nice honeymoon destination within driving distance. You can have a nice wedding without breaking the bank.
Do not cheat yourself out of a comfortable future to try to grasp the dream of one perfect day.