In the old days the rule used to be that anything bipolar (74 TTL series, Linear, BJTs, UJTs, JFETs, diodes) did not require antistatic shielding at all and the only ones that were carefully shielded were the CD4000 CMOS parts (and later the 74HC). We all went our merry way without really knowing if a failure could have been caused by static or not.
Nowadays, after seeing some failures caused by static and other failures happen completely without explanation, I am much more conservative and tend to treat parts with a higher level of care. After all, static discharges can either damage or weaken the parts depending on their intensity.
I haven't received pink dissipative bags with MOS parts from reputable distributors, but from "the street" I would say it is quite common. Heck, I have even seen foam disguised as dissipative with their pink colour but my EM voltmeter strongly disagrees.