being able to see angels or demons doesn't matter as much as being able to see the will of God in your life and the lives of others and being able to discern between good and evil. it is more important to be able to test the spirits then visually or auditory simulation of seeing or hearing angels or demons. sometimes seeing them is just a distraction tactic used by the enemy to confuse and make you ineffective.
I believe I've seen both but I would rather talk of God and His ways then that of His messengers or of Satan's minions.
why are people afraid of demons? they have no power because JESUS has defeated them upon the cross.
Remember these verses among many others:
2 Timothy 1:7
For God has not given us a spirit of fear, but of power and of love and of a sound mind.
Colossians 2:13-15
New King James Version (NKJV)
13 And you, being dead in your trespasses and the uncircumcision of your flesh, He has made alive together with Him, having forgiven you all trespasses, 14 having wiped out the handwriting of requirements that was against us, which was contrary to us. And He has taken it out of the way, having nailed it to the cross. 15 Having disarmed principalities and powers, He made a public spectacle of them, triumphing over them in it.
When the Bible speaks of Principalities and powers, it refers to the demonic realm, the spiritual powers of evil. GOD has triumphed over them and disarmed them, why do people through their fear and unbelief give back to these creatures chains and whips to enslave themselves again to the lies of the world?
2 Corinthians 10:4-6
New King James Version (NKJV)
4 For the weapons of our warfare
are not carnal but mighty in God for pulling down strongholds, 5 casting down arguments and every high thing that exalts itself against the knowledge of God, bringing every thought into captivity to the obedience of Christ, 6 and being ready to punish all disobedience when your obedience is fulfilled.
God bless and keep you all.