sometimes, yes i do! It's all dependent on what I need to achieve. Although they're easier to learn than a brush, Nibs are something I've never completely warmed up to... they can fight you depending on the type of board you are using... smoother board is better. The more texture a board has, the more likely the nib can pick up fibers and smear, or catch on the board itself. When you first get a nib out of the package, wave it gently a time or two over a candle or lighter... it helps it to hold ink better.
I've noticed a lot of this stuff and it's good to see some of it "codified." Another thing I've seen is that eyelashes pull double-duty as eyebrows when you don't need the arch effect; usually during implied face-hoof scenes.