Well..i'am already waiting for many years when they come with cpu's with multi cores..i'am not a gamer but i play chess,do analyses and so on..and have never enough cores! There are chess engines ready for 2048cores,so i think i have to wait many years when i see a computer who has these cores!
But you are right,this is just one example off software and chess use these cores 100%.

Here some test results:

Engine ------------- Depth--- Time- Total nodes - Nodes/s.--Score ----- Hardware
------------------------------------------------------------------------------------------------------------------------------
1)TogaII142JD-8cpu 21/46 03:46 208.317.723 7.345.841 +0,26 Skulltrail 2xQX9775 @4.2Ghz DDR2: 4-5-5-17
2)TogaII141SE-16cpu 21/45 03:30 94.511.341 6.843.413 +0.22 Gainestown 2xNehalem @3.07Ghz DDR3: 9-9-9-24
3)TogaII142JD-16cpu 21/46 03:59 96.988.402 6.521.362 +0.26 Gainestown 2xNehalem @2.93Ghz DDR3: 8-8-8-19
4)TogaII142JD-8cpu 21/52 03:31 174.872.390 6.286.188 +0.25 Skulltrail 2xQX9775 @ 4.0Ghz
5)TogaII142JD-8cpu 21/46 03:54 172.582.215 5.891.624 +0.30 Nehalem @ 2.93Ghz
6)TogaII142JD-8cpu 21/50 03:37 154.531.874 5.278.434 +0.26 Skulltrail Harpertown 2xE5430 @ 3.0Ghz
7)TogaII141SE-4cpu 21/52 05:12 364.182.100 4.576.252 +0,20 Q6600 g0 @ 3.2Ghz (My PC) DDR2: 5-5-5-15
8)TogaII142JD-4cpu 21/52 03:48 260.594.079 4.556.842 +0,23 Q6600 g0 @ 3.2Ghz (My PC) DDR2: 5-5-5-15
9)TogaII142JD-8cpu 21/48 04:19 106.946.778 3.351.022 +0,20 2xOpteron 2347 @1.9Ghz

JP.