Yes, absolutely worth it. I'm 175cm / 72kg 100% park skier and I've got weeks on every tongue available for the Dropkicks. Used only the 12's for the current season and haven't felt a reason to go any softer. (I'm actually in the process of switching to a race boot.) The stock tongues are just way too soft for anyone the size of an adult and above the skill level of absolute beginners IMHO.
Do yourself a favor and invest in a Booster strap, Patriot Tru strap, Head double power booster strap, or Atomic professional dual strap as well.