>How big? Back when I worked in a big company, most of the people I dealt with were not in my office. Heck, many were not even in the same country.

Fair point. It's about 100K employees across the globe, but I'm in the largest site. And you're right, it makes a difference. Even at this site there are multiple locations in the city, and there are differences even between different locations within the city (e.g. one location had a lot more talks by external speakers).