I tried Aperture for a while, but I never really understood exactly how and where it wanted to store and catalogue everything.
I still use iView media pro at the office, as I've got 10s of thousands of catalogued images here, and its also an ageing G5 that probably won't take too kindly to the latest stuff.
I use Lightroom 3 at home though, which is awesome, and though I've barely scratched the surface it pretty much allows you to bypass PS completely.
The only bug so far is that I can't get the NIK Silver Efex plugin to work in LR - to do a decent B&W conversion means opening the image in PS still...