Yeah, I think it was Bob Justman who told their new cameraman (Jerry Finnerman)...'go nuts'.
And he did, there's tons of innovation, bright colors, dramatic setups. For reference, I remember reading about how they busted ass to make that scene in Naked Time flow smooth. You know, where Spock has his little breakdown. That was done all in one take at the end of the day. (Source: Star Trek Memories by The Shat)