I've never purposefully taken a neck or head shot at a *healthy deer, but did have an arrow go through a doe's neck once when she jumped the string. I got lucky that the broadhead found the mark and kept the tracking job within a couple hundred yards, as opposed to missing anything important and just wounding her.
I don't take full frontal shots, just a personal preference, and never had a situation where I couldn't wait for at least a quartering shot instead. YMMV.
*I have taken head shots at deer already wounded by others, at close range.
---Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.---
---Enlightenment is the ability to take infinite pains---