Well, By the time Ivy Bridge E comes out, it will be two year, that is a long time in processor world. I miss the days of Moore's law of getting like a doubling of performance every 18 months.
I remember having a 500 mhz Pentium3 and then like 2 years later, got an Athlon XP 1600+ and that was like night and day then.
I remember like 2 years later getting an Athlon 64 3200 and that was like night and day compared to the previous one.
I remember going from That to Core 2 due E 6600, and again, that was like night and day.
I remember going from that to Core 2 Quad Q9550, and that was a lot bettter, but more importantly, I didn't go that route, but I remember the folks who went from a Core 2 duo like I had and went to the Core I7 processors, and they had a huge jump.
For me, I took the route of coure 2 quad first, and then went to the Sandy Bridge E 3820, but 2 years is a lot of time, and to only get 5-10% performance then, that sucks.
For the GPU days, 2 years use to be two generation, so again, same huge improvements like for me it was going from Rage card to Radeon 64 DDR, then I had the Radeon 9700 pro,
Then the 8800 GT (nVidia),
then I was stuck because I still had an AGP motherboard,
finally when I switched to the Core 2 Duo, I also got a Radeon 4870, and switched it shortly after for the 5850, and now the 7970.
It seems AMD and Nvidia are both in a rut as well, because the next general is going to be late by 2 years, and I don't have high hopes for the old days of massive gains.