That is basically what I do. However, I doubt you are talking about the upgrade only taking a couple of minutes. The last time I did an upgrade, I went from 3.0.12 to 3.6.8 and my site was down for about two hours. Most of that time was taken running the upgrade script and making my backup of the database and all the files (you need both of those if you need to downgrade cuz things didn't work out) and scping my backup/files to another server. Once the site was backed up and upgraded, it probably only took about 10 minutes to install the plugins and import the templates. Of course, then I did a couple of tests on my board to make sure my custom products worked.
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