I don't admire any arranger player who doesn't use his "fill" options. That's what makes YOU own the song. How you manipulate the breaks. Almost anyone can play a tune fairly well if you get amnesia and forget there's a "fill" button there for a reason. The good players are the one who can work perfectly timed "fills" into what they're playing. Another way of saying: it's easy enough to play a tune if that's all you're thinking of (playing the tune). The players who rise to the top are the ones who are simultaneously thinking how to work the "fills" into what they're playing. That means "musical multi-tasking which ain't easy.