Yeah, I do see Macs all over here in the USA. Go to any printer, newspaper, graphics studio, audio studio, etc. and you are going to see several. Most companies are PC users in general, but a few are mac focused. My father works for a US based company, and they gave him the choice between an "IBM" laptop or a Ti Powerbook. He went with the Powerbook.
I once heard the following numbers, and I have absolutely no idea of their truthfullness. Don't hold me to them.
In the USA, 3-5% of all computers sold are Macs. ~10% of all currently used computers in the USA are macs.
I also see a huge amount of macs in movies in the US. I'd say 80% of the time, if I see a computer in a movie, it's a mac. Otherwise, it's typically a no name brand computer. Not sure how this compares with Europe.