I love traffic anyway. Overtaking stationary traffic, out-accelerating cars from the lights, to keep catching up again and again cars that overtook you as they get stuck the lights. These are the things that remind me why I'm on my bike - I'm having fun, I'm burning calories and I'm still getting there faster than them in their metal boxes! Maybe I'm strange but sometimes I find clear roads just a bit, well, boring...
As for the train comment - I didn't get to find out. I was 10 minutes delayed getting out of the office which meant I was 30 seconds too late for the train. So I was first onto the next one, giving me plenty of time to get the bike on. I can see the argument against asking people to move and I am happy to sit with my bike in the doorway, but not if I'm going to be told by the guard to get off the train 'cos I'm causing an obstruction. To be fair, however, there were six bikes this morning in a space meant for two and the guard didn't bat an eyelid.