does Steve Jobs spends as much time/effort in Apple as in Pixar? Does Steve tell Pixar animators a thousand "no" till the animation is done "right"? I would guess no.
Steve worked on-site at Pixar one day a week (Friday) until the Disney acquisition. Day-to-day management went through the executive team, primarily Ed Catmull for technical and operations, and John Lasseter for creative direction.
I think Pixar relies heavily (or at least more) on Lasseter (http://en.wikipedia.org/wiki/John_Lasseter) than on Steve Jobs
ps. I would add Carmack with Armadillo Aerospace & ID Software, altough I dont think he is the 'CEO' of both