It's often a useful illusion, but when you're dealing with something outside the normal usage, it can go way off. It results in asking meaningless questions like "Where did we come from?", "Where do we go when we die?", and "Is the guy who came out of the teleporter the real me, or just my clone?".

These are not meaningless questions. The materialist answers to the first two are "we come into existence as our physical vessel developed, and cease to exist when that physical vessel has been destroyed." Non-materialists of various sorts may say "we existed before we entered a new body and depart from that body when it dies". Materialist and non-materialist answers to the third depend on the technology of teleportation. Since teleportation is fictional, you can make up any sort of technology you like to get whatever answer you want.