The transbay busses are slower because they get stuck on the bridge. 8 minutes for bart to cross the bay vs 1hr for a vehicle on the bay bridge during rush hour. If I'm wrong, I would be pleasantly surprised.
I took the transbay NL bus for several months. Never had a ride take anywhere close to an hour, except for once when it was raining really hard, but that's because traffic in SF was so gridlocked, but the bridge was OK.
You're very wrong. The bus has its own lane around the toll plaza. The actual time on the bridge is 10 mins. I make it from Berkeley to SF in 35 mins once the bus picks me up. I can walk to the Bart station but always take the bus. It's a much cleaner and nicer experience. Wait. I mean, the bus is awful. Definitely nobody start taking the g or fs. Thanks.