The settings toggle to disable blue "ghostly" image of an item while moving it!
Scotty
I believe this was originally a bug (supposed to be coop only) that they made into a feature because people liked it. A transparency setting would be the best of both worlds, from 0-100% opacity.
Kit Makin (H4rrisH4wk23)
I personally find it very useful for myself but I definitely think that it should be a toggle option in settings for those who don't like it.