Activity for Private User

When is it customary to finish paying off your vendors? I've seen some blogs reminding to bring all the money in separate envelopes to pay them on your wedding day but most of my vendors request to be paid in full before the event and I am not...

Does it really feel different after you marry? We've been together for 13 years and I really don't want things to change between us. Everybody says it's different after the wedding, is it really?