Hmmm.. Agreed. Filtering between two buses is not a good move (although I must confess to having done it myself, learning a similar lesson).
I do have sympathies with the OP though. Buses on my commute (Fulham <> Bromley) have some nasty habits. Nowadays I leave them well alone, stop well back, or fly by when they're reloading.
The only time they really bug me now is when I pull up behind one 'cos its indicating out, then find I've earned a 40 second wait whilst the engine cooks me and nobody moves.
Ok. Let the bus go first, but please do actually go.
(hmm.. 40 seconds. That's not very significant now I write it. I need some patience).
Edit - Oh. Plus points for the music. Nice choice.