The crazy parts that were mentioned in the parent comment are all part of the hot path. Microcode handles slow paths related to paging and segmentation, and very rare instructions. Not necessarily unimportant (many common privileged instructions are microcoded) but still rare compared to the usual ALU instructions.

But it's not a huge deal to program the quirky encoding in an HDL, it's just a waste of transistors. The really complicated part is the sequencing of micro operations and how they enter the (out of order) execution unit.