I think this just speaks to Golden State's versatility and how well-constructed they are. They can match up with traditional big-men like Memphis has with Gasol-Randolph by using Bogut as an achor, or they can wreak havoc on small-ball type teams like the Rockets. The fact that Golden State just has former all-NBA player David Lee and All-Defense-Team Andrew Bogut sitting there to use when they can is such a great commodity. Add that to Green who can matchup 1-4 and Thompson who has the length and quckness to guard all wings, and you have a great team. That's not even mentioning Barnes and Igudoua.
Basically, Golden State can outrun Cleveland, neutralize their post threats reasonably well any given night (Bogut, Green), score on the block at will any given night (Lee), rain threes (Curry, Thompson, etc.), neutralize LeBron to the most reasonable expectation (Iggy et al.), light a spark (Curry, Barbosa, Livingston, Barnes), and matchup small or big. Kerr happened to realize that small lineups get the rhythm going for his team, so he can make that adjustment with no drop-off in performance. The Cavs are trying something new out of necessity.