I show my card really really rarely, and I think it's better not to do this at all no matter what table you are at - final or other table. No point in boasting, better keep 'em guessing! When you show your card, sharp and observant opponents will inevitably get some good info from you about your play, you just may not notice that but you always leave gen for them. They will see not only how you were playing on the river but what you were doing on every street on every given card. Well, this time your bluff worked well but what about another time when you meet the same players? Even if you wish to confuse someone and get some advantage it seems you give more than you receive back.