I learned about Ctrl + D pretty early on in my software career, probably around 2009 or so, and have been using it 99.99% of the time since then[1]. It's both consistent and easy, so I really can't see any benefit of not using it.
[1] The 0.01% of the time was when I was testing out using Windows for software dev. I don't remember but I don't think Ctrl + D works there.