So I believe that when you learn how to control your movements in your brain, controlling them in real life becomes a little bit easier. You can also do things in slow motion in your brain. From what I understand, this is an important technique for high level athletes and musicians and probably anyone who performs a physical task at a high level.
Yeah, this is big. One's window of time spent learning a trick doesn't necessarily have to coincide with their window of time spent physically battling it (as long as they already are in the appropriate physical condition with the needed motor skills), just like you don't need to physically be at work to put even subconscious thought into work-related projects (and thus indirectly be working on them). These days, it's really not uncommon for me to fall asleep on a new idea and then the next morning, because I've already expected and corrected whatever I could imagine going wrong, it turns out that within a few tries I can just materialize it as if I really always knew how to. If your grasp on the reality of gravity and skateboard physics is developed enough then visualization definitely helps in theory, the mental labor is the same except with the luxury of not beating yourself up while unnecessarily going through repeated motions.
You can also see the complete opposite in those people who sometimes do spend a lot of time trying hard to learn certain tricks, except to no avail despite their insistence throughout the years - physical effort that never leads anywhere because they're not putting actual thought into it, and so really just focused on kicking their board around as opposed to working towards a set goal (as if part of them didn't really want the trick, and it really were just busy work).