are you using a naked portafilter? What about the folks in the video?
That's an easy way to get a large amount of crema initially, but it will probably settle to the same amount you're getting.
And are they using an Export as well? The spring in the Export will not be as strong as others (about 6 bar), and if you're watching vibe or rotary pumped machines they generate more pressure (about 9 bar on properly set up machine)
A better grinder will always help to make a better coffee, but I suspect the difference here is whether or not the portafilter is naked.
Also depending on how fresh your beans are, they will tend to make less crema as they go stale.