I've got a stock 2011 GTI and I can definitely feel the acceleration taper off above 5000 RPM. It's especially apparent going uphill. You can see it in the stock dyno chart as well. The torque curve drops over 40 lbs-ft starting at 5000 RPM.
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My previous car was a 02 Audi A4 with the 1.8t motor and I can tell you that with it and any car that comes turbocharged from the factory that isn't a dedicated sports car (IE- 911 Turbo, GT-R, etc) The torque and power will always die off at the top.
Car manufacturers use the smallest turbo possible to minimize spool time and give it a nice punchy low to mid torque so the average consumer is like "OH MY CAR IS FASTTTTTT" When in reality it is not.
The pull all the way to redline is one of my favorite thing about my FRS. It is so much more exciting than a mid range torque shove.