i haven't put much thought into this until recently, and I've put probably 2000+ hrs in this game
but passive skills with proc chance: distortion field, storm surge, battle rage, and death ward.. probably also adrenaline (not sure i haven't played defense mastery since long ago from TQIT).. they go well with high CDR
distortion field in particular, i used to leave this at 1pt because the 5% chance proc is too low.. but if you have very high CDR, it actually becomes worth maxing.. just compare it with a dream char with no CDR and one with high CDR.. distortion field will proc more often
battle rage too, it will noticeably proc more often with very high CDR
death ward may actually become more useful.. don't know i don't play my bonecharmer anymore
storm surge will noticeably proc more often with high CDR
of all these though, maybe only distortion field is worth maxing if you have high CDR.. but maybe the upgrades of battle rage becomes worth more than 1pt?
ah just give this mechanic a chance if you play CDR builds
edit: just to be clear, it procs more because the cooldown is lessened with CDR.. my distortion field cooldown from prophet is now only 6 secs instead of 30secs.. storm surge is now only 1.2 secs instead of 6 secs
passive skills with no cooldown, like volley, are not affected