i'm sorry but anyone who thinks that since they skateboarded they are going to have a easy time snowboarding is sadly mistaken. it helps, but it doesnt mean you are going to be any better than the guy next to you just starting.
aside from the fact you ride on a piece of wood there are no similarities.
strapped in vs on shoes
wheels vs snow
2 ft long vs 4-5 ft long
flatland vs heavy inclines
it helps a lil in the regards of balance, and thats it.
i've been on the snow since i was 5, and snowboarding since i was 11 ... and when i step on a skateboard i def dont find it any easier
completely different styles