Nope, don't like visors on my helmets for the same reasons
Iride01 described -- makes my neck ache to crane it up from a road bike. I don't even like those short brimmed cyclist caps.
I prefer as much unhindered peripheral vision as possible. Even my otherwise good POC Omne Air Spin hinders the view above my eyebrows slightly, because the POC EPS foam and polycarbonate shell are a bit thicker than some helmets, and fit a bit lower on my forehead. I mostly wear that helmet on my hybrids with more upright ride where it's not a problem.
I can't say sun glare has ever caused me any problems. Occasionally I wear sunglasses for bike rides, running and walking, but often park 'em atop my head if I'm not facing into the low sun.