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Roll down a hill next to a fat bloke and see if you still think that. Initial acceleration is the same, but pretty soon it becomes clear that fat blokes' aerodynamic cross section doesn't increase as fast as their mass, so they achieve a higher equilibrium velocity.

Finally someone that might be able to shed some light on this...

When snowboarding I seem to be able to go faster than alot of my mates, could never figure out whether it was my weight or board, I thought it was my weight, often using the phrase "gravity is my friend" however they debated that items of equal density will accelerate at the same rate etc and that whatever weight advantage would be counteracted by lack of aerodynamics.

So what is it? I also wondered if in a small way being heavier would compact the snow/ice harder thus creating less resistance between board and snow?

I am not a scientist.