I do this all the time with long distance transportation, I guess because there's always more people with me and we're all equally affected by whatever happens in the trip. It doesn't apply to trips around a city, mainly because there's so many people getting on and off the bus all the time and not really a sense of reaching a destination.
So, questions: Am I the only one who does this? And specially, how weird would it be in English to use "we" in this context? What about other languages?