IMO - Pages and Numbers don't come close to matching the functionality of MS Office apps (keynote is pretty close though). They are fine for basic needs, however.
I use my Mac at home and really haven't worked much on it. Here is a list of apps I find noteworthy (in no particular order):
* Pixelmator - Great raster image editor with a nice user friendly interface
* InkScape - Not a native app, but probably the best free drawing program out there and a worthy install on any computer I use.
* MS Office 2011 - I suspect we will be seeing a new version here soon... but I haven't heard anything yet so I may be wrong.
* Unison - Great Usenet downloader and reader. If you are a Usenet user, I doubt you've seen a client this nice on Windows ever.
* OpenEmu - For all your emulation needs (well..most of them, anyway). Nicest interface of any emulation program, hands down. Really shows off the Mac OS X UI well.
* Tweetdeck - Probably the nicest free twitter client around.
* MPEG Streamclip - Its a bit dated, but runs like a dream on OS X. There is a windows port, but it sucks on Windows for some reason. Great for quick clip edits. I use this to shave down my video files before importing them into iMovie
* HandGrenade - Good video transcoder.
I'd stay away from TextMate as a general text editor. It doesn't even support split screen mode or anyway to view two different sections of the same document at the same time . I haven't found a good text editor for Mac yet. I've been using MacVIM mostly.