Oh, come on. All of it is now end-to-end encrypted. Unless you're using some cheap Chinese setup.
These approaches are not just theoretical, they have been shown to work. And that's assuming the protocol itself is not vulnerable and has been implemented correctly. Moreover, I tend to use my keyboards a long time, making it likely that a new attack becomes possible over its lifetime.
I still occasionally use a wireless keyboard to type in a password, but by avoiding these, I also lower the probability of interception.
It makes me most uncomfortable when I am typing log-in credentials to my personal home server, that could be used to log in over the internet.
Other than that, I work at a lab, which sounds like a juicy target for leaving a passive Bluetooth sniffer in a closet somewhere.
I've just played enough with BackTrack (now Kali Linux) in my teens to know that other people may be doing the same.