I felt the same when I went from my P182 to a P280. They don't make 'em like they used to (just eight years ago...). I moved back into the P182 a few weeks later and sold the P280.
As for USB, you might consider an external 3.5" USB3 bay device, such as the one I used in my build: viewtopic.php?f=14&t=63926
Yeah, I wonder why cases are getting so cheap. All the expensive, high-quality ones seem to be gaming-oriented and have all kinds of flashing lights, windows, fins, etc. which I don't want.
Anyway, I looked into the idea of using the external bay slots for USB3, though I'd rather find a replacement for the current front ports; I looked around, and at least one person who was going to try it seems to have given up and just bought another case. The main reason I don't want to do that is I want to keep all those bays available for other things.
Another reason for me was wanting to use a classic old Plextor CD reader/burner I have that was the last of the "made by Plextor themselves" models, and was the best for CD reading, but in taking my P182 apart today, I saw that it had an old IDE interface (not SATA), so I probably will just need 3 bays now (2 for external hot-swap hard drive bays, 1 for CD/DVD/Blu-Ray burner). So I might have one left for a USB3.
Hard to know what to do, since a build takes some time and I don't really like putting together a build only to take it apart again and move it to another case. If only I were rich, I'd commission a nice custom case. :-/