Yeah, (i) leave enough slack between you and belay point so you can move around and (ii) avoid having leader climb directly above belayer’s head. The extreme case was when I was in Peru on Alpamayo (snow/ice) where the leader fell on top of his belayer and put a crampon through belayer’s scull, killing him. Nasty, eh?
Also, even large solid flakes that people have been yanking on for decades come off eventually, plenty of stories in Yosemite – so even though the Central Pilar of Frenzy (nice climb with greazy start 1st pitch) Glenn refers to is a well beaten trade route, he is totally right not to rely on previous cleaning.
Main thing is to use the head. Better a live turkey than a dead eagle, eh?