The Ascension also suffers a bit in the doctrinal arena, too, mostly from people who think it's clever to point out that if Jesus really ascended, he would have gone into orbit. They say this because they have no poetry or biblical literacy.
The Ascension is important because it marks the final point of the arc of Jesus's work. The point of him ascending, of course, is not that he goes into the sky as such, but that he is at his Father's side. He didn't continue into the blue, but was "hidden from their sight". The ascended Jesus is the Jesus who is vindicated and victorious. He is the one who we can deservedly worship and marvel at, and in a dialogue between earth and heaven, he pours his Spirit into us to make us more and more able to know him and follow him. You don't need to go to church today to remember that, but if you do, then let him fill your heart with his presence and power.