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Any movement key will do the trick. I usually use cursor-right or the end key.

It's so ingrained I had to actually do it in a shell to know what it was I did.

ISTR pressing one of those keys would obliterate the part of my line where I was writing, putting in ^B characters.

I can't replicate it now on my test box; it works exactly the way you say it should. It may be a terminal issue; I'm currently on Windows using cygwin to ssh to Linux.

C-g (as in quit https://www.gnu.org/software/emacs/manual/html_node/emacs/Qu...) is the 'proper' way but yeah, not the only one.

That just wipes out the whole line (on my test box).

C-e ?