I think people misuse and overuse the bluff. Once I figure out someone is aggro bluffing, esp in cash games, I just wait to get a hand like a flopped set and take their money.
I think I got semi bluffed live the other night and laid down TPTK, but I think most of the time it's OK to fold to a bluff if you aren't sure where you're at in the hand. Money saved is money earned and all that. I got blatantly bluffed in cash online last night ; the guy showed and pointed out "when you don't get cards you got to bluff." I disagree with that logic in a cash game; but in MTTs and SNGs it makes more sense.
I occasionally will bluff on a checked down board if there's only 1-2 players in the hand and I'm last to act to take a small -medium pot. Or as someone else said, sometimes C-betting missed flops is considered a bluff to take a small pot.
The problem with bluffing is that it's overused at the micro and low stakes. Unless you have a great read on someone, most people are calling down with ATCs. I tried a bluff live with top high cards and got called down by like 63o, guy had paired the 3 and there were high cards on the board. I'm ok with folding to a bluff to save my money if I have no idea where I stand in the hand and I'm ok letting pots go instead of trying to bluff the pots into my stack.