I agree entirely. I'm used to calling 'w ______' as a habit, though it does indeed help to know who you're actually spamming on and where he is in the first place. The 'South West Wall' from leaders over TS is indeed vitally useful, however when it comes down to it, if you're as the North East wall at the time, the chances are that by the time you're at the SW wall, the target has already moved on

So yes, i agree, spamming even 'w' is necessary to
pin-point the target.
~Mugger84