With the Bus strike today, I saw relatively few buses on my commute. There was a big union presence by the bus garage near Thornton Heath Pond, and between Croydon and Streatham I only saw a single bus, when I'd probably see upwards of a dozen.
Similarly where I cross from Walpole Street to Anderson Street, over The Kings Road, I almost invariably meet several buses, but there were none to be seen today.
The traffic wasn't significantly worse than usual. Around Thornton Heath Pond there was some congestion, but that was probably the only point on the entire journey. The lack of buses seemed to make it overall an easier trip, not that I think that would be the case if buses routinely didn't exist along my route. I'm assuming a lot of people decided not to go into work, and started the weekend early.
There were quite a lot of people at the bus stops, but given the small number of buses I saw, I suspect they had a long wait.