Actually, there are lots of catch phrases going the rounds that are not actually Americanisms - someone already mentioned "no worries" - typical Australian English.
Happily, a lot of these annoying expressions go out of fashion again. Does anyone still say that something is "dead nice"? I remember being told off for using that one when I was six.
My father's generation "dropped a clanger" if they were ex-RAF, my grandmother having won an argument had "put her neighbour's gas on a peep" and I am sure these expressions annoyed others in their day.