Snowboarding is pretty different really. After a winter of boarding, and not surfing as much, my paddling goes a bit wrong. I think my cutbacks definitely improve due to boarding, probably because of the front/back weight transition that you use a lot when boarding, but the rest of it doesn't help much.
Surfing definitely helps with snowboarding steep slopes in good powder (which is where it's at for me), it's very similar, all back foot, powering through turns etc.
Bottom line, snowboarding (and I guess skiing) and surfing are both great fun, you don't do one to get better at the other. Just surf more if you want to improve at that.
I hope you feel better Tomcat. Early season injuries suck
