From a visitor's point of view, I think fika complements or is a manifestation of the fluid, open, consensus-based way Swedes get things done.

I think those things are usually done with clicks of people while a "fika" will often apply to all in office. Like you yell "Hey, everyone let's go fika, and everyone goes fika". It's also usual to have a set fika appointment around 2 or 3

In blue collar workplaces and many larger white collar workplaces there are scheduled coffee breaks. So the difference from spontaneous short coffee/cigarette/watercooler breaks is pretty big: it's a full company break over coffee, at least once or twice per day. You are considered a bad colleague if you are to busy to take the 20 minute fika with your peers.

Yes, but there's also more implication of baked goods and communal chat with your colleagues