I'm in aircraft engineering school right now, and i can tell you blisks are definitely in use.
For example the Rolls-Royce Trent 500 turbofan, or the Allison Model 250.
(The latter of which we have a cut-open version of, on a dolly here)
This is the turbine section as blisk (edit: corrected from fan)
And this is the compressor stages as blisk vvv
If you ...