Yeah his FB is a very underrated pitch by the fanbase. It's a very good pitch in its own right (that he's gotten quite good at commanding over the years btw) and when you factor in guys need to be focusing on his changeup it plays even more up. He's just got a plus FB that plays double plus because of the changeup and an 80 grade changeup.
Just for comparison's sake. Yoho's changeup that everyone has been raving about has the same horizontal movement and 6-7 more inches of vertical movement despite throwing his changeup 6-7 mph slower than DW. DW's changeup is and will forever be a circus pitch. That combo of spin, velo, movement out of a RHP hand just shouldn't be possible.