Precisely so. Central Italy is also quite good on this in my experience.
This image tells the tale, and is a reminder how things are supposed to work:
Unfortunately all too often we end up with some self-righteous SOB camped out in the fast lane doing the speed limit, or 5pmh under. Or some idiot jabbering on his cell phone doing the same thing. They both need to be ticketed for failing to yield right of way to the string of cars stacked up behind them.
I was outside of Atlanta a few months ago and flashed my lights at someone doing 55 in the left lane. The bozo came to a dead stop in the left lane. The person was incredibly stupid or incredibly PO'd that I flashed them.
I don't know about where you live, but in Texas you can't be cited if you're doing the MAXIMUM SPEED ALLOWED BY LAW. Slower traffic keep right, means slower than the speed limit. The few areas where the left lane is for passing only are clearly marked.