Not sure how good it is or how far its features go because I've never used it, but there is an app called
Cadintosh, from the same developer who brings us (the rather good) GraphicConverter.
It's also been a while since I suffered the horror of using Windoze, but fear not when it comes to navigating OS X.
You have the 'Finder' app (similar to Explorer) for navigating your hard drive, and the directory of your hard disk is set up quite intuitively. Basically at the root level you have your Applications folder, as well as Library, System and Users folders.
System speaks for itself and you will likely never need to look there (unless you are a power user / the tinkering type).
Library contains additional files needed by certain applications and the system, and the chances are you won't neeed to go there much either.
Applications speaks for itself, and Users contains a 'Home' folder for each designated user of the Mac, so that their files are kept separate from other users.
Within your Home folder you have subfolders for (your private) Desktop, Documents, Music, Movies, Pictures and all the stuff you might want to store on your HD. As well as another Library.
Takes a couple of hours (if that) to get a handle on and after that becomes a doddle to navigate.
Welcome to the light side mate
🙂