Besides, using lead solder can save the planet by using less energy - you do not need to wait ages for the lead-free stuff to melt.
That's a pretty rubbish argument 
I use leaded solder as that's what I find easiest. I'm not in the market of producing high volume electronic goods but if I was then I'd be switching to lead free as it's better for the environment in the long run.
Who knows, when this roll of leaded runs out I might buy some decent lead free stuff and see how it works (and throw out the Kg of lead free I have sitting around which doesn't work quite so well - if I got a temp controlled iron it'd probably be ok)
I heard the stuff about lead free eating through your iron faster and that it's best to tin with tinning compound after use rather than the lead free solder to minimise this. Anyone (other than me) had their tips being eaten up by lead free?