I still really like my HHKB, but I think I've always liked tinkering and modifying things. Since I can't justify modifying such an expensive keyboard, and there are limited replacement keycap options (although the stock ones are great) I find myself actually typing on my heavily modified POK3R more. When I get my LeandreN r4 pcb/plate and build my own 60% with a similar layout to the HHKB and 67g Zealios, I think I may find even less reason to use the HHKB.
The one thing that I really like about the HHKB, that I wish I could get on other 60% boards is the two part plastic case. Honestly, if there was a group buy for a very simple, high profile 60% case in an off white and rough texture, it would sell so well.