There's HUNDREDS of die varieties in the last decade, the Minnesota quarter alone has over a hundred different DDRs if I remember correctly, as well as cent doubled dies for 2004, 2005, dozens for 2006, well over a hundred DDOs and DDRs for the different designs of 2009, a good handful DDOs and DDRs for 2011... a new
DDR for the 2010-D cent was just discovered last week.
Anyone who says there isn't many varieties just isn't utilizing their resources. I specialize in cents so that's what I'm most familiar with, but I know there are many, many others for other denominations as well, likely over a thousand different in the last ten years!