IMO...casually walking around and talking normally after you're done calling is just as bad as shooting crows if coyotes don't show up. In both cases there's the chance coyote(s) have snuck in undetected and are hung up in dense brush trying to figure out what's making the sound. By shooting or allowing them to see and hear you, you've just taught those animals to associate your calls with humans which can make hunting them more difficult. You really should be approaching coyote hunting the same as if you were hunting deer. Sneak in, remain undetected, sneak out.
You don't need to avoid areas where you coyote hunt if you wish to call in crows. Just use sounds that are intended for crows such as crow/owl fight, crow/hawk fight, crow in distress, etc. You'll call in far more crows and greatly lower your chance of educating coyotes. I've never called in a coyote using these sounds.
When I began hunting coyotes in this heavily pressured area of SWO, calling in coyotes seemed to be much easier than it is now and I can't help but think that's due to the somewhat recent surge in coyote hunting in Ontario and hunters inadvertently educating animals.