I am so used to eating with knife and fork, I ended up having dinner unconciously holding a teaspoon (that was meant for dessert) in my right hand when we had dinner at his parents' house once.
My husband (the USC) eats with knife and fork too, maybe because he has lived in Europe for so many years and had to go out to LOTS of fancy company dinners... I don't know.
This reminds me of a discussion I had a long time ago, with one of my husband's good friends.
We had steak for dinner, and I noticed that people ate them differently. Most of the Americans in our group cut their steak into bite-sized pieces, put the knife down and ate with their fork.
I cut a piece off the steak and eat and cut and eat...
That one friend and I started discussing which way was the fastest and I insisted that mine was faster (not that that's the point when eating a goood steak

) because I cut and chew while cutting the next peace. He insisted I was wrong.
Months later- I had never even thought about it- my husband got an email from his friend saying "tell your girlfriend she's right".
He later told me he did some test series on eating steaks and in the end had to admit that I was right...