In the past 15 years of cell phone usage, I think I needed to dial someone while driving about three or four times, and that happened while I was stucked in a traffic jam where I wouldn't endanger anyone, including myself, by taking a brief look at a phone screen (and I didn't even need to look hanks to the haptic feedback of real buttons and speed dial).

Most of my past cell phones had that ability and I never used it. Frankly, I really can't think of a situation where that missing feature would be a dealbreaker, or even high enough on my list of priorities to even care. Additionally, since I'm living in a country where English is not the main language, most of the names are really weirdly pronounced when interpreted by standard English patterns, so the best I could do with voice dialing is to dial the number itself, and I gave up on the habit of remembering phone numbers long, long time ago... I have yet to see a good voice dialing in my mother tongue even tho it utilizes the simplest form possible for a computer interpretation out there (it's a a phonemic language).