What does John 3:13 mean, NO MAN has ASCENDED to heaven? By faith Enoch was translated that he should not see death; and was not found, because God had translated him. (Hebrews 11:5)
And it came to pass, as they still went on, and talked, that, behold, there appeared a chariot of fire, and horses of fire, and parted them both asunder; and Elijah went up by a whirlwind into heaven. (2 Kings 2:11)

If Elijah and Enoch (funny they all start with the letter E) where translated what does John 3:13 mean, NO MAN has ASCENDED to heaven?
In the risk of sounding way too much catholic :p here is my answer:

Ascension and Assumption are two different things. Catholics believe that only Jesus came down from heaven and went up to heaven on his own power. This is called Ascension. Others like Enoch, Elijah and of course Bl. Virgin Mary were taken up by God. (i.e., not by their own power) This is called Assumption. Catholics and Orthodox have always explicitly differentiated Ascension and Assumption.

Also it is interesting to note that in 2 Corinthians 12:2, Paul speaks of a man who was caught up to the third heaven (presumably by God) and came back alive.