Being an Aussie, we grow up on coir matting/synthetic pitches when playing junior cricket, so we all learn to play the hook and pull shot instinctively.
I got my mum and dad to buy me my first helmet back in 1983. It was a Duncan Fearnley helmet and it cost my parents $75, which equates to about $370 these days (about 240 pound), so it was far more expensive than these days. It had the perspex face guard which was damn heavy and damn hot compared to steel grills which came much later.
I wore that helmet only rarely, preferring to relying on my wits and my bat to survive. On matting, I got peppered with bounces, but other than once top edging a pull shot onto my chin in under 16's, I never ever got hit.
I made my cricket come back after 26 years out of the game two years ago and decided that as a bloke in my early 40's, I must have slower reflexes so I invested in a couple of helmets. I use an Albion Ti 22 with the bowling machine sessions and in the nets.
I play on turf now which is not as bouncy as coir matting, buts ome bowlers can still propel the ball at fantastic speeds.
I also purchased a Masuri Titanium which I wear only when I open the batting on weekend games (the first 5-10 overs) before it is discarded and on Wednesday comp I wear it at all times as this midweek 40 over a side competition attracts district cricketers who are out to have a second game for the week. District cricket is our equivelant to County Seconds - and we occasionally get first class players playing, as I got hit for the first time ever in the skull by a guy who plays for Trinidad Tobago when the ball somehow crashed through the space in the grill and the visor as I left the largest possible space for greater visibility.
I DO prefer to bat without a helmet...it is in the blood I guess, but I have bowed to the wishes of my wife who insists I wear one...so I do wear it if I feel it is necessary.