Simple, I use a file renaming tool.. I'd do *exactly* the same thing on a linux box, even though it CAN be done with a single (too complex for the average user) commandline in *both* OSes... (Windows Powershell is not the old CMD crap...)
You are missing the point: The problem with external tools is, that since renaming files is an OS task, if you need external tools, the OS is missing functionality. Even MS-DOS could be "fixed" this way (and its shortcomings were "fixed" by countless third party tools). This also rules out Powershell, because for some reason, it is only part of Windows Server operating systems, however, Microsoft would do a good job to make Powershell the Windows default shell, it would make the OS a lot more usable. It would also need more tools, i.e. tools to extract information from files, like the dimensions of a png file, or the author of an mp3 file.
The point is that these kind of operations, wether it's generating a list of files satisfying various criteria, renaming then, converting them are very comon in any document collection, and document collections very often occur in professional environments. While I agree with you that not every user is able to write the command lines necessary for the operations, my experience is that one must not question the intelligence of the poor "average user"; it has happened me more than once that a "computer illiterate user" did successfully edit scripts I wrote for him.
Anyway, if you need an external tool on Linux to do renames, Linux is broken too for you. So there might be some personal preference. What I do want to point out, that many people, including me, do not consider Windows an OS to use for serious work. The Windows command line unfortunately is not the only component that is lacking. Instead of the features one needs, one gets talking dogs and paperclips.