I don't use inbox. How its weekly reminder different from a calendar based reminder?

I started doing GTD. I use Calendar for my "hard schedule"—things that I have to do on a specific day and/or time. I use Inbox reminders for my "hey do this if you get the chance." And then I keep my big todo & projects list in Docs. I find they all occupy a slightly different and nice niche—todos & projects in permanent stuff, inbox for "soft time", calendar for "hard time." I find there's a lot of mental benefit to separating these things out. When something is on my calendar, I know that means do it. When something is in Inbox, I know I should just get to it as soon as I have the time and energy. (This works better with inbox zero though; if you have a bunch of other emails etc lying around it dilutes the reminders.)

It's probably not that different. But inbox's reminders are lightweight and easy to setup, and since I'm constantly in Inbox anyway, I always see them. Inbox reminders also show up on Google Calendar.

There's more to Inbox, like snoozing reminders (and emails). It just all comes together as just the right reminder package for my needs.

Agreed on Trello for everything.

I have separate "teams" to sort my many different boards for my work-related notes, my side-business notes, and my family-related notes.

Planning out meals a week at a time also makes grocery shopping simple and painless.