Thinking you deserve a quick response to every email you send is entitled bullshit. The presumption of this tool is that your time is more valuable than mine. It's insulting.
I may not know it's machine-generated the first time if you hide it well enough. But I damned well will the second or the third.
Personally, I put a rebump on an email to someone I need a yes/no answer from. Maybe it's a proposal that needs approval. Maybe it's whether they'll be joining us this weekend for a beer (because I have to make reservations). I don't expect an immediate response, but I set a rebump for a day later (default is 3 days) because I shouldn't have to chase you down to get a simple answer.
Definitely see your point about how annoying it would be to get these one email forwards from my great-aunt, though. We are trying to convey to users that Rebumps should be used judiciously. It seems to be working so far.
There's a wide range of urgency between sending a reminder after 3 days and ringing someone up to demand one right now. A Rebump works on a message that the recipient intends to respond to, but didn't, due to wide range of logistical reasons. If misapplied, it is the sender that will suffer the consequences.
I may not know it's machine-generated the first time if you hide it well enough. But I damned well will the second or the third.