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I've done a fair amount of Sage development and I still haven't learned queues. I do understand the ideas, and I see the advantages, so someday soon I will switch to them, but at the moment I am too lazy. You can just clone a copy of Sage, work in that, and if things get messed up clone another copy from the main branch. Cloning can be annoyingly slow but if you are multitasking its not that big a problem.

In summary: queues are good but not necessary.