First, those push tricks don't always work. They probably will be right a lot of the time, but you can't depend on them.
As far as snowboarding, it isn't necessarily obvious when you're first starting out. I wasn't really strongly one way or the other either. But what happens is that you'll start to learn things (like heelside turns) and you'll find yourself doing them easier one way than the other. In my case, when riding what turned out to be switch, I didn't always get the board turning in time so I'd end up just butt-planting. Didn't have the problem riding regular. Eventually it just became easier to stick to regular.