For me, I've done the BB druid rings --> Gfay run so many times that I can pretty consistently hit it dead on.
On more than one occasion, I have pointed myself at my destination, hit autorun, tabbed out/went AFK, and then when I got back, I was in the new zone already! I realize this isn't really impressive in the Karanas or EC/WC, but when it happens for some of the other zone lines with little zig-zaggy corridors, it always at least makes me smile.
I'm not entirely proud of this, but also not entirely embarrassed by it either.
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I also have these two runs in Gfay down pretty well at this point:
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