Don't use <cr> as mapping key in normal mode.

It interferes with behaviour in buffers like 'q:' or 'Ack' results; <cr>
in those buffers act directly on the line you are on, but since <cr> was
mapped to opening a line, this would not work correctly.
By adding the CONTROL- and SHIFT key to the mapping, this works
correctly again, albeit we'll have to retrain the muscle memory.
History: remember more commands and searches.
Higher command line height.

I'm liking the visual distinction that indicators like 'INSERT',
'VISUAL', 'SEARCH HIT BOTTOM' and the likes are on the bottom row, while
commands are on the top row.
Disable airline... If I don't miss it, it's gone.