This also varies between states and facilities. I routinely place EJs and lines, we are allowed to needle decompress under our policy (although this is almost always during neonatal resuscitation) and have scrubbed in and placed chest tubes with our Docs, and have on occasion still placed ET tubes in the ED and the Units; when I'm in the field I can act with a full scope of practice under our medical directors.
There is a lot of time I spend feeding kids, changing diapers, educating parents, and all of the other 'nursing' type things. I don't think that this makes me a worse medical provider, nor is this something that is exclusive of paramedics.