You've been misinformed my friend. Animated backgrounds (live wallpapers) and widgets are a feature of Android 2.1 and not just Sense UI.
So you'll have access to those Using Sense UI, Ninja Blur(droid X) or even just running Stock Android.
you can go to Androidcreations to see a list of the popular live wallpapers, and search the forum for widgets you may like. When it comes to nice widgets I suggest going to threads that say post your homescreen or something like that, so that you can get an idea of what good widgets people are using.
As far as Efuse, that's not the way the efuse works. It's not constantly scanning the phone to see if it's been rooted. All it does is when the phone is started up, it checks the bootloader to see if it is an authorized bootloader and not one that somebody made up. You can still root the phone(in fact, I think it was just rooted the other day), but until somebody cracks the efuse, you just can't install custom ROM's like Damage Control or Cyanogen.
If you're not interested in doing stuff like that, then the Efuse shouldn't concern you at all.
P.S.
Somebody correct me if I'm wrong but that is the understanding I have about the subject