Still on a Q9550 at 3.7Ghz, and I feel absolutely no compulsion to upgrade to an 1155/1366 rig other than for epeen reasons. I'm not CPU bottlenecked by ANYTHING except the final level of Crysis, and do I really want to spend $500 just to play one level of one game at max settings? I get 50fps+ in every other game I own. The responsiveness of my system is limited more by my crappy SSD than my CPU. I don't encode, and benching is pointless.
Back in 2009 I thought, "I'll upgrade to an i7 920 before the end of the year." In 2010, "I'll upgrade to an i7 950", beginning of 2011, "I'll get a 2500k". But my Q9550 keeps chugging and handles everything I've thrown at it.
I think the 1366, 1156, and 1155 platforms are overrated. Yes, you get good CPU performance, but unless you bench or do specific highly threaded apps there's no real world benefit. This whole "2500k/2600k or bust!" mentality is annoying.