Fact check time... my magic spreadsheet says the top 5 shooters/48min are Jefferson by a long way (24.5), then Catch'n'Jack (20.8) closely followed by Burks (20.1), then a slight gap, then Millsap (18.0) and Howard (17.6) close together. Then daylight to... this is interesting... Favors (14.7) ahead of Hayward (13.8) and Harris (13.6).
However, this only takes into account shots that count for stats. Burks is the leader in FT/48mins (just ahead of Howard) which indicate he gets a lot of trips from fouls on missed shots - add these missed attempts to his stats and he would clearly leapfrog CJ for second place in the shots taken count. So your perception of his shooting rate is supported by the facts. Given his 42% shooting percentage he could certainly exercise better judgement with his shot selection, other than when he is attacking the basket and drawing fouls, of course (where an improvement in his 72.2% FT% wouldn't hurt either).
However, in spite of his volume shooting, he is also fifth in the team in assist rate after the three PGs and Hayward. And fifth in rebound rate after Kanter, Favors, Millsap and Jefferson. So he may be a chucker, but he's not a one-dimensional chucker.