This is not my colony, but I do play very large colonies. The answer is in the numbers; if you have enough colonists set to do the same job, it will get done. The only problem is that things like workbenches get reserved. So workers with a specific task, like cooks, get assigned a bed near their work spot, because all the time they’re travelling to their stove, it’s reserved and can’t be used by other cooks. All goods they require to do their jobs are hauled in by other colonists
It’s not too bad really, once you have it set up and make sure there’s always enough resources, it just sorts itself out. You have to play at low difficulty, though, or it will get to being a lot of work, really fast