As a musician, I remember when I was in your shoes. When OS X came out, there was no audio software for it at all. A few things trickled out, but for the most part there was nothing until around the release of 10.2. Up until about 6 months ago, there were lots of holdouts, waiting for this app or that plugin to make it over the fence... but you know what? We're all better off now.
I've had very little experience in design (I took a course on Quark 4.11, Photoshop 6, and Illustrator 8 in the OS 8.6 era,) but OS X 10.3 has literally revolutionized the way I use my computer. It allowed us to jettison kludgy junk apps in favor of well designed integrated frameworks within OS X, (say goodbye to OMS, and hello to Core Audio!) It has given us great versions of the apps we already loved, amazing new apps that rely on the UNIX core of OS X, and most importantly, killer productivity enhancers like Quicksilver and Exposé. I miss Turbosynth and Studio Vision (the Classic OS apps I had to leave behind,) but you can have my G5, Logic 7 and Reason 3 when you pry them from my cold dead fingers.
I hope that 10.4 and Core Image does for designers what 10.2 and Core Audio did for me... and if not, I wonder if 10.5 will bring Core Type and other goodies to finally sooth your soul...
Mac OS 7.5: Better than Tiger Will Ever Be
Mac OS 7.5: Better than Tiger Will Ever Be