Always better to be safe then sorry, right? Not saying you shouldn't spend the time on it, just that IME it's not necessary to draw it out to the same extent as fish. My situation is a bit different working for a reef wholesaler, as I'd have to acclimate hundreds of corals each week. But I am constantly moving corals between our main coral system and our display/photograph tank which has a higher salinity, temp, and pH, and have yet to experience a problem with a single peice that I've moved.
As far as the Iodine dip, Green Lobster, when I get in 50 euphyllias, you better believe I'm going to dip them! Most exporting countries don't float them, and you never know how many could be coming in with minor damage you can't see until the next day. Pieces that have been sitting at a good LFS store for a little while I would not be concerned with dipping as any problems should be visible. Though again...it never hurts to be cautious.