“I don’t have to install “SomethingMac” to occasionally use anything. :)”
Right … if you wanted to run a native app from another OS, you’d just, um, … :)
I have DarWine installed, but I think I’ve used it twice (in 3+ years). More as a proof-of-concept than anything. With the native OS X apps and the large catalog of compatible unix software packages, I never seem to have a problem finding the tool I need.