Yes, it is a whole new universe.
If you like the Interceptor and it is in your price range, that is a fine first e-bike. Pedego makes some nice e-bikes.
As opposed to hub-drive versus mid-drive, excellent recreational bikes are made both ways. A mid-drive will more easily climb a very steep hill, but the tradeoff is that you will have wear and tear on the chain on derailleur. But the technology is moving very fast and that might not be so true going forward -- mainly because e-bike specific derailleurs, chains, and cassettes are coming out and they are made for the abuse that running a mid-drive puts on those components.
Find a dealer near you and test-drive some bikes. I'd really hesitate to spend $3000+ on a new member of my family and not get to try it on for size first. I'd also recommend renting or test-driving some other brands than Pedego, just to give yourself a basis for comparing different bikes. If someone rents e-bikes in your area, call around and find out what brands they are renting and try them out.
Also, spend the extra money and get the biggest battery available for the bike you pick out. You'll thank yourself later.
Keep in mind that you will also inevitably drop $500 (or much more) on bike tools, helmets, bike racks, and other accessories.