Not a lot. Mostly Solidworks at work and on contract projects since I own a license. I have a seat of Rhino that I use once in a while. Alias was what OSU taught.
I am trying to learn some animation techniques so picked up some poly modeler techniques. Silo is cheap so I bought a seat. It is not really all that great for hard core mechanical forms, but it is a different workflow and I am trying to not get set in my ways.