This is kind of the same as the topic you just made before, but I'll chime in.
That is more a part of you being new than being how it actually is. I've never gone an hour without reviving someone, you just need to pick your battles.
People definitely respawn. If you're in a vehicle, don't bother taking calls that are over 5k away -- You wont make it there, and they wont wait that long, even if you could. If you want to take every call, you'll need a helicopter,but even still, most people will not wait for you. It's a bummer, and some folks put forward great ideas to combat this. But for now it is what it is. Robbery can definitely be a problem, but your medical gear respawns. Just don't carry money with you as an EMT and you the robbery wont be an issue.
Stick to populated areas, especially while new. Run to the sounds of gunfire or follow (a good distance behind) police when they are using their sirens. It's almost certain they're going to a place where there is or will be shooting and violence.
Take the talents, repair peoples vehicles, repair broken legs.
Even with it's shortcomings it's pretty fun to play. You just have to adapt to the situation in the game.
Edit: I was James Archer in server 2. To answer your question (I didn't realize your radio wasn't on) we were in a group because we're both EMTs. Coordinating with other EMTs is really useful, so when you spawn as EMT, you should always turn your radio on, and leave it on channel 1. Then you can tab to the radio channel like you would switch to directional/group.