1. If you are only building one drawer, yes, maybe you could cut the dovetails faster by hand. However, once you get your jig set up, you can make lots of drawers in a hurry.
2. Once you determine through trial and error the jig settings for a particular bit and drawer thickness, you record that setting and skip that step in the future.
3. I use two routers for dovetailing and don't change the bit until I'm finished with the dovetail project. That saves the step of changing bits and setting the bit depth.
4. If you're doing half-blind on front, why not do half-blind on the back too?
“We should be careful to get out of an experience only the wisdom that is in it and stop there lest we be like the cat that sits down on a hot stove lid. She will never sit down on a hot stove lid again and that is well but also she will never sit down on a cold one anymore.” - Mark Twain