When I first 'flew' - as SLF of course - I paid attention to the safety briefing. A few years later, travelling 2 or 3 times a month I thought it was 'cool' to show that as I was a regular [and therfore very important] pax, there was no need whatsoever for me to pay any attention to the briefing.
Now however, thanks partly to PPRune, and also to being a lot older and wiser, I always take care to put down my book/newspaper during the briefing, out of self-preservation and also out of politeness.
The one thing I always do without fail, is to count the number of seats between me and the nearest exits [in front and behind] - I'm always amazed how many pax never seem to look around them during the safety briefing.
I know the chances of an incident are rare, [which is perhaps why so many non-frequent fliers seem to be so un-concerned], but it is always better to be safe than sorry - which is why I agree with radeng - I do not want to be obstructed getting to an emergency exit by someone going the 'wrong' way.