I actually came up with a very sweet reveal for the Vortex deck tuck case that has never been done before, and it really does add dimension to a trick in that it is a bit of an optical illusion.
Reveals can be useful, and there is no reason to not take the extra time to include them into a deck. Still, some reveals are ridiculously idiotic (the bar code ones, for example). I believe purely in creativity. If you can't innovate a feature, don't include it in the deck.