Maybe not 10x but even just noting stuff means that picking up an older task that you had to shelve before could go from a 15 minute thing to a 30 second thing depending on what context you put down/how accessible it is.
Ultimately a lot of this stuff is commingled with comfort with tools and general ability to juggle things though, so hard to isolate the effects
If I was a good note-taker and had a rich, deep journal which was searchable - I'd be 100X more than the 1X me right now.
Not journaling is a big regret of mine.