Finally! I've found the audio editor for the Mac to do all those little things like trimming, noise reduction, and more. Amadeus Pro, from Hairesoft, is just what they say, the swiss army knife of sound editing.

It loads fast, is intuitive to use, appears stable, the noise reduction works great, and has some nice features such as multitrack support, batch processing, markers, and more. Free demo, $40 to purchase.