Oct 23rd 2006 11:57PM I am an extremely heavy UI modder but believe these changes are actually good. They will make for more interesting ways of highlighting actions that need to be taken, rather than taking those actions for you. There's already a lot of really inventive new unit frames coming out which will make the boring old "whack-a-mole" healing style much more intuitive.
If you're looking to get ready for the BC UI changes then I recommend grabbing some good unit frames such as X-Perl or ag_UnitFrames and getting a good click-casting mod (Clique is the best/easiest IMO and already works in BC). This way you will be good to go when the expansion hits.