Some great advice from FieldingMellish.
I have to agree that I prefer to get it right first time in camera as opposed to just clicking away. This is only because I learnt a lot of what I know from my dad who was a semi-pro photographer, and back then it was all film and chemicals
The only real problem with the "clicking away" method is that it's very hard to actually work out what you're doing wrong that way. Obviously it costs nothing and that's a great thing, but I think that also means people take less time to understand why a particular shot does or doesn't work.