Mike,
Today I had juuust enough time after dinner to remove the throttle and cruise control cables and fired it up after the hose check. Unfortunately the high idle problem is still the same, so we can rule that out.
To check the vac hoses theory, I found a parts diagram from Village Toyota that has a pretty complete set of parts diagrams as compared to other vendors. I checked each and every one of them. All were on there pretty solid, but to your point and my earlier concern, perhaps they are collapsing when in operation. So when I can devote some time, I'm going to put the old hoses back on.
Man I wish I had a smoke tester.
I'm also going to remove the airbox/intake hose assempbly, test/recheck the IACV and throttle body (see below), and take another look at the air hose that attaches to the underside of the IACV.
I did find this interesting post by a YT member who noticed that his butterfly valve was rubbing up against one side from (he presumes) is wear and the effect of the return spring pushing the valve to one side thereby causing it to stick. Interesting observation and fix that seemed to have worked for several people. http://www.yotatech.com/f2/my-high-idle-cured-258318/.