Goodness, I never expected an innocuous observation to turn into a heated debate!
I do run with a 2nd spec that has Hawkeye. I use it for Saurfang, Putricide and Lich King. I take the points out of Imp Hunter's Mark, seemingly logical as the range is only used for target swapping.
On Saurfang Hawkeye lets me hit knocked back adds.
On Putricide I can turret between both gas cloud locations, feigning off any volatile ooze injections.
On Lich King I don't use Hawkeye to dps Lich King (Although we do when all adds are dead earlier on in transitions), I do use Hawkeye for 41 yard Tranq shots, killing orbs, but most importantly for Vile spirits. 51 yard kill shots across the platform save lives.
Putricide Kill Sans-Hawkeye
95.5% @ 7560dps without hawkeye
Putricide Kill with Hawkeye
99.9% @ 9657dps with Hawkeye
Although the parses are 2 weeks apart, my autoshots are only showing a 7% dmg increase, yet my damage done and active dps time skyrocketed with hawkeye by 22% dmg and 4.4% aDPS.
To answer NebelWerfer's question about where I was pulling the rDPS numbers on Lich King, I was using World of Log's median Kill dps listing. Don't get me wrong, I think that with more Heroic loot Hawkeye's benefit will become obsolete. However, while learning encounters, and squeezing every inch of dps and maximizing my role, I'll be rolling with it as an option.