It is rarely used outside of the lower fora.
Meanwhile, Thork's use of transparent text in the upper is at times disruptive. If anything, the transparent colour option will be going long before [you].
But every day there are several examples of a thread with [you] in it.
As far as I can tell, this is simply false.
Also, as someone with a burning hatred for the BBC, you should probably learn to use the [nobbc] tag.
Anyway, let's propose something that might actually be workable instead of just making fun of Thork. We could implement an option that disables the [you] tag on an opt-out basis. The joke then gets to live on for all intents and purposes, but those who inexplicably worry about their Complete Nonsense and Angry Ranting experience (what's wrong with you?) can accept that they'll just see the string "[you]" in those places. Though I would only be willing to waste my time on this if it was a common complaint/request.