Just took this tour a few weeks ago in March. We went on HM and COP. We had Anibal as a guide, who was excellent; he had also done a previous tour I took, Keys to the Kingdom. I definitely learned things I did not know but honestly, seeing how they do the ballroom ghosts at the HM was worth the price of the tour even thought it was less than 10 minutes. (Note: Attractions are subject to change, and you should not take the tour strictly to see the inner workings of one scene in HM) The detailed walk-through of the HM cemetery and the commentary on COP was excellent as well. For $30 (or less with an AP or Disney Visa discount) and a smidge over 3 hours, it was very worthwhile. Since you are looking at going on your own, I think it would be perfect-my tour was over by 11:15 or so, and you'd still have the better part of the day to spend with your DH, and he can surely amuse himself for a couple hours while you take the tour.
Ress