I do.
I just added cheap computer a week or so ago, so I could monitor the difference, which is anywhere from 1 to 2 mph depending on headwinds in a tuck (drops or hooks). If the wind isn't getting me, I tend to stay on the hoods, where I still stay pretty low.
I dialed in a good fit, which is key. The neck pain can be remedied by using your eyes, not your neck, to look forward. Try looking at your eyebrows, that will let you keep your neck straight and unbroken, all at the same time. If your optics get in the way, you may want to try some goofy looking "blades" that ride higher, which support this sort of gaze.