Depends on which build you are using. Currently if you want to use deprecated methods you need to use the compat build. We're still tweaking some of the builds around during the beta to get a good set of them. When developing we are trying to always throw a warning when you use a deprecated method as we really want people to end up with as clean and compact a build as possible. There is currently over 40k of deprecation code in place, it makes a huge difference -- especially for mobile.
Well, I don't want to use or teach things that are not recommended by Sencha and will eventually be removed.
Yes, getDockedItems and getDockedComponent are useful, no doubt, just as the dockedItems config is. You could simply use the CQ for getting the docked items, too, so what's bad with helper functions or config options that make your code cleaner and more explicit?
I really tried to get used to it, but still couldn't.
The docs search problems seems to be a cache issue (using Chrome). Works using another browser.