I feel like the only person in the world who was thoroughly underwhelmed by it and really don’t see how its future space requirements for a staircase can be justified. This isn’t me trying to be edgy, I like cathedrals, this one (and his general style) just left me cold. Duomo in Milan was far better imo.
I had the same type of feeling. Sagrada felt more like a zoo / tourist attraction then an actual religious building. The design is impressive but it didn't bring the uumpf that Duomo did.
Milan's Dom isn't that impressive to me, but perhaps that's because I've seen more grand, old churches, and the Sagrada Familia felt like something different.