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.