I don't think it's abuse either, but back when Prime was $79 and small items shipped free, I cringed at the thought of buying, say, a pack of razors from Amazon. It felt wrong.
Exactly, it offends my sensibilities to order such things 2nd day unless I'm likely to really need them that quickly. And with their incentives for slower shipping (but still pretty fast as a rule) like $1 in free digital goods for a limited time (a few months) they recognize that. They also use it to promote their Pantry system (regular bulky subscriptions that some in big monthly boxes).
And it makes me feel non-abusive when I order something for 2nd day that's close to the line.
In general I find it a sane system, would be even more so if I didn't live behind a slow broadband connection and had made my household 100% Linux.
Like you when I need something small, I usually just add it to my next Amazon shipment. Pantry and Subscribe and Save have almost made it where I do not have to go to the grocery store. Add in something like Blue Apron for fresh dinners and I may never have to go to the grocery again.
I miss when I lived in Denver and had a milk man. Every week he would deliver milk (obviously), eggs, bacon, bread, juice, etc...
