I still say P and TY. I can't help what others do.

I have a face that looks like 100 miles of bad road and a glance that I've developed which implies that "I'm happy to let it go or deal with it now, your choice" without resorting to words. Course, I smile lots so that helps.

I have only twice that I recall ever tapped someone on the shoulder so I could exit a bus or metro. I tried 'pardon me' and 'excuse me' in both English and French. One fellow moved and gave a look that suggested he hadn't heard me. The other let me through after I said, "Kindly let me by or you'll be leaving the train (subway) with me." Of course, when he did move I thanked him. Didn't want him feeling everyone was a rude as he.

Some people are preoccupied, some hard of hearing, some tired and others just plain wankers. C'est la vie.