At micro-stakes the big bluff isn't that useful, but people will call OOP and fold to a c-bet so often it's almost unfunny. I c-bet alot, simply because it works. In the long run I get a lot more folds than calls making it worthwhile, obviously it depends on the players though. Sometimes you can bluff the good players with the big one, which is more of a touney play I like to make. In cash games it's less worthwhile.
I like to bet at small pots especially in a tourney with a decent stack. Usually the players I play overbet with a re-raise, and it onl takes one time of me not fooling around to put them out, I do it to set up traps.