I donk lead sometimes, almost always as bluff though unless gameflow dictates otherwise.

Against players playing a wide button range (ie raising every hand preflop), and then who check behind a lot of flops, you need to donk lead a lot into them. This is because your flop range is going to be so much stronger than there's that you want to make sure money is going into the pot on that street.

However, i have yet to play a player that checks behind enough to warrant tons of leading...