I've been using Apple computers since the original Macintosh
. I currently have a 20" iMac.
But I also have a lot of experience using the window platform because of my engineering degree. I have to say, for ease of use and stability the Mac wins hands down. Software is a little more limited, but that has been improving a lot recently. Even when I was in college (almost 10 years ago now), my Apple computer was more stable and reliable running DOS emulator software and Windows platform engineering programs than most of my friends windows computers were, running software that was native to that platform.
As far as "being lost", it does take a little time to get used to the different interface. I hate going back into the PC's at work and trying to remember all the key commands or trying to find settings/preferences I need. However, the Mac OS is very intuitive. Just run around and click on things. You'll have a hard time doing anything that will cause you problems later. Also, if you go to the "help" menu on the main menu bar (top of the screen), Apple has all kinds of tutorial video's available. They also have quite a few tutorials on the apple website under "support". They have several introduction videos for the Mac OS.
But really, its pretty simple. Everything you need to get started is on the "dock" (menu bar looking thing at the bottom of the screen), or on the menu bar at the top. Everything on the desktop is pretty much drag and drop, and your preferences are under the "system preferences" icon on the dock. All the software should walk you through its set up the first time you open it. Also, not sure if you have a 1 button mouse or not, but if you do and need to "right click" on something, just hold the "control" key down and click. I use a logitech mouse as I was never really fond of the 1 button thing. Makes things easy most of the time (and for new users), but sometimes you just have to right click.
Just forget about all the BS you have to do in order to do what you want on a PC. On a Mac all you have to do is click on the picture, drag and drop, or follow the instructions that the OS will walk you through.