I've been a Mac user since 1990. I had to buy an external hard drive for it, since it only had a floppy drive. The hard drive was a whopping 30 Megabytes! At the time, I thought "How am I ever gonna fill this thing up?"
Now, I have a lamp-style iMac at the office and a flatscreen G5 at home, while my wife has an iBook.
However: I don't like Safari, I prefer Firefox. I don't use any Apple office app, I prefer Word and Excel. I don't use iPhoto, I prefer Graphic Converter. In fact, the only Apple apps I really use are DVD Studio Pro, iWeb, iTunes (even as I yearn for the OS8-OS9 days of SoundJam) and Quicktime (even if I use VLC more often). I prefer the flexibility of third-party apps, as I'm more of a tinkerer and tweaker, so I'm very picky with the functions that I want.
But the best app for the Mac ever? Claris Filemaker. There is nothing remotely like it in any other platform, an astonishing piece of database software.