A day doesn't go by that I do not hear the word "notion".
At my workplace, its use is rampant..,three times on this morning's team concall alone! (I would bet that at our last conference, it was used well over 50 times during the various lectures.) On NPR, every educated person uses it. At the conference I went to yesterday, it was used four times. I don't seem to recall it being used so much in the past, but like many things, you don't notice them, until you notice them. Enough of my co-workers know this (I've mentioned it to them on numerous occasions) that we have a smile/nod routine whenever we hear it.
The car you are driving, the first week or two that you drove it around, I'll bet you thought that there were hundreds of the same make/model on the road (actually there are, since there really aren't that many different kinds of cars). Something new to us always has a way of heightening our senses of it. "YOU are reading that book, too?"
Different businesses (accounting, consulting, software, etc.) probably all have their "words du jour". What things consistently (annoyingly?) stand out in your life?
[Update] One of our former interns found a phrase that irritates him.