Picked up my JettaWagon TDI last Thursday and on Friday I used it for work to go for a 350 mile commute. No cruise control, varied the RPMs with the foot for the entire time. No cruise control..
Then I used it Monday to commute from NJ to central VA and back Tuesday night. All with the foot and varying RPM. I actually welcomed the opportunity for Stop and Go traffic because I got to travel in the 1000's and the upper 3000's. I also wasn't afraid to step on it during the last 500 miles a few times. Now I have about 1200 miles on the car (Which never had to downshift for climbing some major hills in VA! With 3 big guys on board)
I finally used the cruise during the last 50 miles last night and it is a real blessing. My right foot was getting sore...
So.
I think you are fine after a careful 1000 miles to use the cruise... In my opinion.
Love my new car