Medic students spend some time in the ED, but most of what they do there is practicing IVs. They also go to ORs to practice intubation. I don't know the exact figure, but I think they spend < 200 hours riding with various paramedic services in the area, some of which don't do a whole lot of ALS calls. Having had medic students riding with me and my partner, I can say they don't get a whole lot of experience this way.
I can't speak for other services, but the commercial ambulance I work for require new medics to ride as a third with a paramedic preceptor for one or two months, and experience varies. Keep in mind that I work for a commercial for-profit ambulance service, so precepting medics aren't immune to interfacility transfers, even when they and their preceptors throw a huge fit.
Even if they have very productive ride time during school, and their precepting goes well, they have about three or four months of practice before being let loose on the unsuspecting public. While for some people this is enough oversight, and we do get some good medics right out of the gate, it still doesn't compare to the support a new nurse or physician can expect.