It has the feeling of literally giving away my credit card to someone. I'm not sure that's a good thing.

Plus, I don't know anyone anywhere anymore that's confused by a few credit card fields.

Plus, tabbing from the number goes to the name field and not the expiration.

Then you'll still have the problem of probably having to enter a valid billing address on separate fields.

I don't know if this really improves anything other than the aesthetic is very pretty.