I've been listening to their music since the early 90s, and to finally be able to visit the church in person was very thrilling.
I left my hotel at 7am, and took the F train from 42nd Street to the Jay Street-Borough Hall station. People were already streaming in at 8-plus.
The entrance to the church is simple and does not reveal how cavernous the inside is. I got a seat in the fifth row and admired the interior, especially the roof in the sanctuary. I reckon the hall had about three thousand people, and on stage, a choir of about 250 singers of different races.
What struck me was how diverse the church is. And I think they get quite a bit of visitors too. I saw a group of older ladies from a church out of state (they had name tags on and came in a coach).
Here is a short clip of the Brooklyn Tabernacle Choir practising before the 9am service I attended. Solid stuff.