TommyBoy, the AI doesn't really do the lower echelon stuff when you turn on "computer control". What you do is give ALL the decision making power of a particular region of the Pacific Theater over to the computer. There are several regions (North Pacific, South Pacific, Central, SW, and two Chinese) and you can delegate the computer to take over any of them.
It's not a good idea except perhaps for the Chinese regions. I had the SW Pacific region on cc for a while in my current campaign, and it basically sat there like a lump.
If you have control of a region, you've got to do EVERYTHING. Run the logistics (although that can be automated somewhat), decide which base needs upgrading, route forces to bases, decide how much CAP goes up each day, what targets to hit with LBA (although you can't designate specific naval targets), etc, etc. Subs take up a lot of your time; each one has to be monitored to make sure they're not out of ammo/fuel or aren't damaged, and they need to be moved around or ASW forces will find them quickly. If you put them on computer control they go halfway across the map to some obscure enemy port rather than where you want them to go.
You're basically the operational commander of all the regions; you don't get to run the tactics of the individual battles, but your decisions prior to the fight will influence how it turns out. And yes, the learning curve is STEEP.
I can't post the original link yet, but what is he talking about here in the first paragraph?
Giving the AI control of certain theatres was possible in the original War in the Pacific, but due to the way the AI has been changed for WitP: Admiral's edition, this is no longer possible.