http://www.militaryfactory.com/cockpits/imgs/f16.jpg
Interfaces designed for experts tend not to hide important information and high performance features.
This Mac based product (http://www.publicspace.net/ABetterFinderRename/) apparently doesn't allow search and replace operations at the same time as sequential numbering even though it almost certainly allows both.
That you want "not to hide important information and high performance features" does not imply the interface has to be poorly designed. A well designed interface can accomplish both.
Most interfaces "designed for experts" are poorly designed crap --and make the work of the "experts" needlessly hard. That some swear by them is mostly "Stockholm Syndrome" (or it gives them a false sense of accomplishment to use something so badly designed, er, I mean "designed for experts".
The Mac interface uses modes for crying out loud.
You'll find out that a well designed F16 interface also uses modes. You don't want to "launch missiles" and "adjust height" in the same menu.
Oh, and the "expert interface" par excellence, Vim, also uses modes..