I always kind of assumed that most developers who work at these Google-level places automatically reflect without a specific process to force it, but maybe I'm just projecting.
Personally, I have a hard time stopping myself from reflecting on the code I've just written and the code I'm currently planning to the point where it is almost a social problem. (eg. my girlfriend will be telling me about her day and in the back of my head my brain is rewriting some code I actually wrote in an editor earlier to be simpler and more efficient... great for my productivity, bad for my relationships).
Personally, I have a hard time stopping myself from reflecting on the code I've just written and the code I'm currently planning to the point where it is almost a social problem. (eg. my girlfriend will be telling me about her day and in the back of my head my brain is rewriting some code I actually wrote in an editor earlier to be simpler and more efficient... great for my productivity, bad for my relationships).