I agree that Sins requires little micro, but unless you have no carriers, support cruisers or cap ships, you probably shouldn't go get coffee. Each of those can be micro'd to get far better results than the AI would otherwise.
And Starcraft requires 10x(probably more) more micro than Sins. Especially in small engagements, but even 200/200 fights can always use you microing your units into the best position. Hell, some unit compositions(Protoss sentry heavy or Terran bio heavy) essentially require good micro to work well.