I've played with mzscript since many years
I've made real huge scripts
I've spent many time switching from mzscript-0.9 to 1.0 in rewriting most of my scripts

But when I've started to play with lua, I've definitively switched to it
It's a little bit more "abstract" than mz but it's really an object oriented langage
It should be part of the "GlobalSchemes" project (OTS3)
Then...