I have a folder called "daypages" in my dropbox. Each day in my life becomes a file in this folder. Today's is "daypages/2016-10-26.org" That's about it. I don't really organize by project much.
Each day typically covers the tasks that I intend to get done that day, along with places I've been / friends I've met. The occasional tearful journal entry punctuates the otherwise mundane. Every morning, I spend a few minutes arranging today's daypage and rescuing forgotten tasks from yesterday.
No matter where I am or what I'm doing, a keybinding quickly flips to today's daypage. From there, keybindings can go back or forward by day or by week. I just jot everything down as I think of it or experience it. (I implement this with emacs/org-mode, but i'm sure you could extend this idea to any configurable text editor)
When I need to find something (whether "united frequent flier number" to "cool restaurant in SOHO" to a link that i captured six months ago), it's only a `git grep` away. Emacs has incremental search for this. If I need to schedule something, it goes in my calendar or in that day's daypage.
When I'm in the mood to reminisce, I just flip back to last year's daypage and spend the afternoon drinking tea and reading about the lovely things that happened last year.
It's like Google for the last three years of my life. Maybe this wouldn't work for you, but my small but growing collection of daypages is now one of my most prized digital possessions.