I used to edit in soundforge, but the Sony incarnations became more and more buggy, so I moved on to using the DAW of choice.
If I am Batch converting, I still fire up an old version of Soundforge on a PC (still sitting on XP) as it is stable and converts without fuss.
As I migrated to MAC and away from cubase and soundforge (work didn't support them), i couldn't find a wave editor that was intuitive enough for me on MAC and spent my time migrating from using PC editing with transfer to mac with Pro Tools mixing. As work relied on Pro Tools for everything, I kind of got used to editing within PT and then migrate sessions. To be fair, it was a compromise and a bad habit that I am now getting myself out of.
I was excited to see Sony release sound forge for MAC, as it has been my go to editor for a while now, but it seems that Sony have released a version that has taken a backwards step (ask Chuck Russom)
Audacity is...ok, and I am not being a snob here, but I find it clunky and there is nothing that Audacity offers that I can't get elsewhere that works better with injecting just a little bit of cash