Yup sooo true and the main reason why more people don't do it. The first week is much harder on a board and often more painful but the 2nd/3rd week on a board you will progress much quicker than on skis i.e. 4 weeks on a board and you could easily be playing with small jumps, rails and powder. On skis you won't.
The general rule is
Skiing is easer to get the basics, much harder to get the intermediate skills but probably easier to get advanced
Boarding is harder to grask but much easier to get to intermediate but harder to get very very good on.
[obviously there are exceptions but thats how it evens out normally]