As for visual and implied magic - the horror movie analogy is good. Here is why - look at Blair Witch - you never actually SEE the witch - it was a HORRIBLY filmed movie, but had a great cult classic ending. You don't see the witch, so the monster in your head is created (implied magic - LIKE a card coming to the top after doing a DL then placing X card in middle, and showing it on top). This monster scares you, as I would HOPE the monster you create with your OWN imagination, is larger than the one I can create in reality...no matter HOW scary. If you look at a movie like "Halloween" - Mike Myers is creepy and scary, but as an adult mind, I am not scared once I leave the movie. I don't imagine how he MAY look, only how he does...THIS is like visual magic. I SEE the monster you create, or the move (think of the visual rise of "Ray's Rise or any outjogged visual ambitious sequence).
Each has their place - but the question is when and why - however, I personally believe that the implied sequence is stronger, because I allow YOU to use your mind to fool yourself...after all...we all agree magic happens in the mind...not the eye. Moreover, if you look at classic effcets, like Darwin Ortiz' All Backs- he does 3 visual "prints" of a "marked" card from a double back to an ending that happens in the particitpants hand - with a implied change. Classic magic for a reason...well thought out and strong endings.
Without giving too much away, there's a version of B. Smith's Wounded where you display your open palm, and a wound simply opens up out of nowhere. The wound itself is quite small, but due to psychology and a simple move, you actually plant the image in your spectator's mind that the wound opened up much bigger - it didn't grow bigger afterwards, it was ALWAYS that big.
After I watched a demo of it, I swore that part of his skin popped open and folded back to accommodate the wound (no such action takes place). My mind made the stigmata a lot more graphic and impressive than it already was.
There is a strong effect in letting the spectator fill in the pieces. What I'm thinking to myself now is that it's a matter of WHICH pieces they get to fill in. Like, isn't it a good idea to let them see some magic, but not others? With the example of above, it's quite visual - the wound appears and slowly opens, and more and more blood forms. You as a performer see it a different way than a spectator - their implied version is a graphic, disgusting hole of blood forming and taking over your empty palm. Their explicit version - what they really see versus what their mind tells them later through recollection (which is where magic can be the strongest) - is simply a small wound appearing, a logical gesture, then more blood. The subconscious seems to glorify it for them.
Lots of magicians talk about how, Later, the spectator will tell others about it, and make it much grander. "He never touched the cards!" (He most certainly did), "The coin bent instantly!" (there was a notable delay), "The wound opened up about the size of a quarter!" (MAYBE a dime).
It's like the spectator's subconscious mind is amplifying that to make it more impressive for them. This happens in other things, not just magic. But it still happens: it's as if their mind is trying to make it bigger and better in order to impress them.
I'm still of the mindset that being visual isn't necessarily a bad thing - that's it not showing the monster - but I'm certainly more in tune to what's being said, I think. You can show the monster, you can ruin their imagination, you can fill in gaps for them, but maybe that's through other parts of the routine, not from simply punching up the sensory aspect.
It CAN ruin it, but not always.