Iridium plugs have saved me a lot of trouble, so they may be a waste of time in some of your minds, but I'll never go back to OEM.
Here in Australia, the fuel is basically crap and so full of additives that every time my bike would sit for more than 4 or 5 days it just wouldn't start. After being told by two mechanics that I had to ride the bike every 4 days to keep the fuel in the carbs from "going off" I had no trouble with starts. If I missed it by more than a few days, sure enough it wouldn't start without draining all four bowls. Anyway, I then was told to try Iridiums and now it sits for weeks and will start every time. there is no obvious performance difference but better starts and less hassle is worth it to me. Bye the way, It doesn't actually take any more time, just a little bit more money.