People do still use it, heck I have a tube around somewhere. It is just no longer the go to paste as the cost of similar or better non conductive pastes are the same as AS5. As the performance of AS5 is no better than alternatives and it saves you no money I tend to avoid recommending it based on the fact that it is conductive and could potentially cause a problem. Secondarily to this AS5 does require a burn in for full performance so some people freak out when their system is not performing as well as expected right of the bat as they are not waiting for the final temp results after burn in.
Yes.. 200 hours is a bit of a wait lol. I'm going to put my x58 rig back in my main case, This z77 board has a weird usb glitch that I cant seem to shake. Its a real pita. I like the speed, and all that, but My x58 didn't give me those issues. So I guess I will see how my new cooler works on LGA1366. I'm thinking I will just flip the z77 and maybe roll with something a little newer.