I do keep notebooks that I write in whenever I need to work out my emotional state, but that's not necessarily daily.
I've recently begun a habit of journaling (in the "this is what's on my mind and distracting me from actual work" sense - writing it down seems to get it off my mind for a few hours) and meditating every morning as a focus-enhancing habit, and that's been pretty effective.
Been doing this for about a year, and I've noticed that writing down every idea does seem to have increased the generation rate of new ideas -- but that's not a bad problem :)
Two other benefits from carrying a notebook:
1) I've never been good at placing events in time, so noting significant events and the date helps me retain a life timeline of sorts. If particularly inspired I might note a thought or feeling about the event, but never more than a sentence. This is the closest I get to journaling.
2) Jotting down a note on paper appears to be more socially acceptable than taking notes on a phone. Typing on my phone has the appearance of ignoring the other person, and giving an explanation can derail the conversation. A notebook is self-explanatory.
(Of course, if you save work emails and have to leave them behind if you change jobs, that can defeat the purpose.)