I have had many experiences with CQEs that were very poor quality engineers in practice. They were just good at memorization.
My interactions have been
mixed. The less-than-positive interactions have been with people who treat the certification as some sort of 'notch'; I have had positive interactions with people who are comfortable with, and use the
knowledge represented in, the (various) Bodies-of-Knowledge (BoK). Certification isn't supposed to be some sort of get-out-of-thinking certificate; to me it is little more than some objective evidence that once-upon-a-time, a neutral third-party thought the holder was able to demonstrate some arbitrary level of mastery.
As
@Miner implied: I have some number of
very discouraging interactions with people who should really have known better, at least per the certifications to specific BoK. I used to tell students: "You are here to learn
something(s), but even if you end up forgetting any details (or facts!)... I want you to remember that at one time
you did learn those things and are capable of re-learning them... either by consulting the materials, talking with me, or conferring with a former classmate."