Apple TextEdit is a great little WP and handles most all my needs.
For more I have Pages. I'm using Excel for Project Mgt at work until I finish the fancy Objective C/CLIPS based tool I'm building, otherwise, I don't need Office type suites so I can't get excited about something that takes a long time to start and consumes lots of memory.
For spreadsheets at home I'm still using AppleWorks.