It was just aesthetic. It's like seeing a big solitaire, or a big show. "Wow, look at all the people, smiling, look at how it looks"
It takes time to experience what the saints of the orthodox church have experienced. It's very hard and requires hardship but the feeling of Union with God is incomparable with your sight being stimulated. Or heck, even ears. People think that if a priest sings well, that means something. Well, it's nice, but it's just sound. It's not God's Grace. Like the basilica you saw, it's just masonry and coloured glass.