I don't think that's what I'm looking for. I want to enter reminders that don't necessarily arise from an email. For example, if I'm asked in the morning to get some groceries, I'd set a reminder in Inbox about that that would arise at the end of my work day.

Now in Gmail, as far as I'm aware, I'd have to email that reminder to myself, and then snooze that email until the end of my workday.

Had a look at the Tasks integration built into GMail now? Essentially the same as reminders. Add a due date and they function the same as reminders - across google calendar as well. On the phone there’s the Tasks app. Works pretty well IMHO, especially having the option to drag an email into a task.

I've been using https://www.followupthen.com/ for this sort of thing

Hmm, that looks nice, but not necessarily faster than snoozing an email I sent to myself when already in my email interface...

It should be (slightly) faster, since you don't need to interact with the email a second time -- instead of writing an email to yourself, write it to [email protected] and it'll get sent back to you at that time.

Ah, it can work that way as well? That is indeed slightly faster - I'll consider it if Gmail doesn't have Reminders by the time I'm forced to leave Inbox.