I wear a helmet all the time and a spine protector when racing or race training but am looking at doing that more often, to include when I'm coaching to set the example - (If my old a$$ can do it there's no reason why you can't).
My view of protective gear is not so much to let me push the limits, though I will admit like OSS said, it does make you feel like you can up your game, but to stave off the stupid stuff; gate smacking your back/head, the new guy carrying gates the first time and turns to see what's behind him, and even simple crashes and falls. One less bruise to contend with.
I've had 4 crashes that required surgery; 2 ACLs and 2 Rotator Cuffs. I know of no protection for them other than me to improve my skills. 3 of them could have been prevented if I was a better skier at the time. 1 was a vision issue (didn't see the clump of yellow ice through my yellow lens).
Another thing I like my back protector for is to help my posture. I noticed it encouraged me to "sit up straight" so to speak. I've been dabbling with telemark the last couple years and one of the athlete's mom coaches telemark now and again. She took me out so I could learn some of the basics and she pointed out my posture needed work because it is more straight up and down than it is in Alpine. I went back out with the back protector on and could feel it as soon as my posture would change. I still suck at telemark but at least my posture is good
I have a Slytech semi rigid vest so it is flexible and I can move around and bend over, but it is most comfortable when my back is in the "sit up straight" position.
Adds a layer of warmth too.
If you get one, pay close attention to the sizing.