True as everyone says the difference is hard to just "feel" as you seem to be doing.
People in general don't notice "speed-ups" as much as they notice "slow-downs". I can't count how many users claim, "My new PC isn't much faster than the old one?". Give-em the old one back for a while and then see what they say!
If you have access to an older 7200rpm drive the thing to do would be to "clone" your Raptor boot/system drive over to the 7200rpm drive, and use that one in it's place. (If you can, replace ALL the Raptors with the 7200rpm drives for even a better realization!)
Since you have been using your Raptors for a while you have a pretty good "feel" for them. If you can do this, when you start using the 7200rpm drive you will notice it's slower.
Aside from that, yes the benchmarks are great, but many of them just measure the "raw drive performance", and that is not always directly transferable to what is seen on a running system. (Different OS, Applications, Controllers, various Hardware, Drivers, all interact and can effect the ultimate perormance.)
All-in-all though, I am and have been a HUGE support or Raptors. I have been VERY pleased with their performance.
For ANY system that I want to maximize speed on I would ONLY purchase Raptors for time critical storage. (boot/operating system/paging files/often used files/etc.....)