Yes. Absolutely. And the sheer amount of fanfic and fan art out there probably made it worse, because the creators are very, very aware of it, as are the actors (Martin Freeman once mentioned a specific fanfic he'd heard of on, I think it may have been Jonathan Ross, but I'm not sure, and it's one I've read, lol!) So, much like with Dean and Castiel on Supernatural, they've definitely taken the fandom's obsession with Sherlock/John and run with it. It's frustrating as fuck, and yet we can't seem to stay away...
He's talking about the one called Sherlock. The BBC's modern re-imagining one. Benedict Cumberbatch's Holmes and Martin Freeman's Watson is one of the most popular m/m pairings out there.