Well you are right and wrong
f0dders point is probably not dismissed by Mozilla. Why make it easy? What are pros and cons? With the extremely stable Firefox and the extremely detailed and useful bug reports you get from public? Massive public now everyone can go click, click.... I almost forgot one more
There is no such thing as "going back" if you research and wait to jump on the train until sure major disasters are unlikely to happen. In theory at least. Wait... then install. That is my approach anyway and why I for example have have not yet tried 3.7 nightly. Not really interested. But check Mozillazines build forum which is the place to investigate daily bugfixes, what is "hot", and get links to Bugzilla where details are chatted about. There is risk Gmail don't work too well 1 day. Not likely but possible. Must be aware of the "risk" involved and that you basically ask for it. File your report if not done already. You are a little "developer". You service them. But you are right it is only for the very interested and I totally agree with that setup. They are very careful. With 2x% marketshare what else should they do. Even build 1 of a candidate to become RC! is still "developers" corner. Imagine the damage if something evil is overlooked and they go crazy on front page with if you can't wait for this new puppy go crazy right now! They can't afford that. Majority look at Firefox like they do IE. There is no room for troubleshooting or "fixing". It works or it is crap.
They also say Profile Manager letting you run a "stable" 3.5.7 and tons of experimental "builds" on the side is a feature mainly for developers. If you go BAH!, and you should, you have no problems with 10 different Firefoxes
Even running side by side. Can't remember which but there is an extension letting you flipflop between different profiles, shortcuts works just as well.