How common are manifestations of charismatic gifts among saints venerated in Orthodox and/or Catholic Churches?
I would venture to say that they are somewhat common, but not extremely common. Most saints prefer not to draw attention to themselves, but rather towards God, the Creator of All.
By contrast, Saints almost universally thought themselves as the greatest of all sinners. This makes logical sense in the fact that the closer united a soul is to God, one has a keen sense of what sin is and how it offends the Divine Majesty.
In 1 Timothy 1:15, the apostle Paul summed up the gospel of God’s grace: “This is a faithful saying and worthy of all acceptance, that Christ Jesus came into the world to save sinners, of whom I am chief” (NKJV). The magnitude of the gift he had gained in Christ was best understood by Paul when set before the dismal backdrop of his own deep depravity. And so, with humble gratitude, Paul accepted the title “chief of sinners.”
There will be found some saints who exhibit manifestations of charismatic gifts in every century. That much can be historically verified in both the Orthodox and Catholic Churches, but to say it is extremely common is not so.
One thing is for sure, that towards the end times there will be a greater outpouring of charismatic gifts amongst all the faithful. I would like to hope that many of them would become saints also.
…16No, this is what was spoken by the prophet Joel: 17‘ In the last days, God says, I will pour out My Spirit on all people. Your sons and daughters will prophesy, your young men will see visions, your old men will dream dreams. 18Even on My menservants and maidservants I will pour out My Spirit in those days, and they will prophesy.… - Acts 2: 16-18